v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2026
Jun. 30, 2025
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2025      
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2025      
Current Fiscal Year End Date --12-31      
Entity File Number 000-56590      
Entity Registrant Name TANCHENG GROUP CO., LTD.      
Entity Central Index Key 0001753391      
Entity Tax Identification Number 38-4086827      
Entity Incorporation, State or Country Code NV      
Entity Address, Address Line One 7th Floor, Jincheng International      
Entity Address, Address Line Two Jiujinci Road, Wanbailin District      
Entity Address, Address Line Three Taiyuan City      
Entity Address, City or Town Shanxi Province      
Entity Address, Country CN      
Entity Address, Postal Zip Code 030500      
Country Region 86      
City Area Code 139      
Local Phone Number 1097-2765      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
Entity Filer Category Non-accelerated Filer      
Entity Small Business true      
Entity Emerging Growth Company false      
Entity Shell Company false      
Entity Public Float       $ 105,786
Entity Common Stock, Shares Outstanding     4,381,550  
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Auditor Firm ID 7254 6732    
Auditor Name Guangdong Prouden CPAs GP Onestop Assurance PAC    
Auditor Location Guangzhou, China Singapore