Number of debt arrangements entered by the entity.

No definition available.

Name:	niu_DebtInstrumentNumberOfArrangementsEnteredInto
Namespace Prefix:	niu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_NotesPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_April2022TwelveMonthRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_January2024SixMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_March2025SixMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_January2024AndMarch2025SixMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_October2024AndNovember2024TwelveMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_October2024TwelveMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_November2024TwelveMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=niu_June2025TwelveMonthsRevolvingLoanFacilityMember
Namespace Prefix:
Data Type:	na
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Period Type:

NOTES PAYABLE (Details)	1 Months Ended
NOTES PAYABLE (Details)	Jun. 30, 2025 CNY (¥)	Mar. 31, 2025 CNY (¥)	Nov. 30, 2024 CNY (¥) agreement	Oct. 31, 2024 CNY (¥) agreement	Jan. 31, 2024 CNY (¥)	Apr. 30, 2022 CNY (¥)	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Oct. 31, 2025 CNY (¥)	Dec. 31, 2024 CNY (¥)
NOTES PAYABLE
Notes payable							¥ 394,285,714	$ 56,382,107		¥ 294,348,768
April 2022 Twelve Month Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Debt term						12 months
Maximum credit facility amount						¥ 300,000,000
Notes payable							184,285,714			144,348,768
January 2024 Six Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Debt term					6 months
Maximum credit facility amount					¥ 50,000,000
March 2025 Six Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Debt term		6 months
Maximum credit facility amount		¥ 60,000,000							¥ 100,000,000
January 2024 And March 2025 Six Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Notes payable							100,000,000			50,000,000
October 2024 And November 2024 Twelve Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Maximum credit facility amount							200,000,000			100,000,000
Notes payable							80,000,000			¥ 100,000,000
Number of debt arrangements entered \| agreement			2	2
October 2024 Twelve Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Debt term				12 months
Maximum credit facility amount				¥ 50,000,000			100,000,000
November 2024 Twelve Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Debt term			12 months
Maximum credit facility amount			¥ 50,000,000				100,000,000
June 2025 Twelve Months Revolving Loan Facility \| Notes Payable to Banks
NOTES PAYABLE
Debt term	12 months
Maximum credit facility amount	¥ 30,000,000
Notes payable							¥ 30,000,000