Exhibit 5.1

Sheppard, Mullin, Richter & Hampton LLP 12275 El Camino Real San Diego, CA 92130-4092 858.720.8900 main 858.509.3691 fax www.sheppardmullin.com

August 12, 2026

VIA ELECTRONIC MAIL

SharonAI Holdings Inc.

745 Fifth Avenue, Suite 500,

New York, NY 10151

Ladies and Gentlemen:

We have acted as counsel to SharonAI Holdings Inc., a Delaware corporation (the “Company”), in connection with the preparation and filing by the Company of a Registration Statement on Form S-1 (the “Registration Statement”) with the U.S. Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”), on or about the date hereof, with respect to the offer and sale from time to time by the selling stockholders named therein (each, a “Selling Stockholder” and collectively, the “Selling Stockholders”), of up to an aggregate of 8,021,282 shares (the “Shares”) of the Company’s Class A Ordinary Common Stock, par value $0.0001 per share (“Common Stock”).

This opinion letter is being delivered in accordance with the requirements of Item 601(b)(5)(i) of Regulation S-K under the Securities Act, and no opinion is expressed herein as to any matter pertaining to the contents of the Registration Statement.

In connection with the issuance of this opinion letter, we have examined originals or copies, certified or otherwise identified to our satisfaction, of such records of the Company and such agreements, certificates and receipts of public officials, certificates of officers or other representatives of the Company and others, and such other documents as we have deemed necessary or appropriate as a basis for the opinions stated below. As to any facts relevant to the opinions stated herein that we did not independently establish or verify, we have relied upon statements and representations of officers and other representatives of the Company and of public officials.

In our examination, we have assumed (a) the genuineness of all signatures, including endorsements, (b) the legal capacity and competency of all natural persons, (c) the authenticity of all documents submitted to us as originals, (d) the conformity to original documents of all documents submitted to us as facsimile, electronic, certified or photostatic copies, and the authenticity of the originals of such copies; (e) the accuracy, completeness and authenticity of certificates of public officials; and (f) that the Company will have obtained such stockholder approval to issue the Shares as may be required by the applicable rules and regulations of The Nasdaq Stock Market LLC.

Based upon the foregoing and subject to the qualifications and assumptions stated herein, we are of the opinion:

1. The Shares have been duly authorized by all requisite corporate action on the part of the Company under the Delaware General Corporation Law (“DGCL”) and are validly issued, fully paid, and non-assessable.

The opinion we render herein is limited to those matters governed by the DGCL as of the date hereof and we disclaim any obligation to revise or supplement the opinion rendered herein should the above-referenced laws be changed by legislative or regulatory action, judicial decision, or otherwise. We express no opinion as to whether, or the extent to which, the laws of any particular jurisdiction apply to the subject matter hereof. We express no opinion as to matters governed by any laws other than the DGCL.

We also hereby consent to the reference to our firm under the caption “Legal Matters” in the prospectus which forms part of the Registration Statement. In giving this consent, we do not admit that we are within the category of persons whose consent is required under Section 7 of the Act, the rules and regulations of the Commission promulgated thereunder or Item 509 of Regulation S-K.

We express no opinion as to matters governed by any laws other than the DGCL. No opinion is expressed herein with respect to the qualification of the Shares under the securities or blue sky laws of any state or any foreign jurisdiction.

This opinion letter is rendered as of the date first written above and we disclaim any obligation to advise you of facts, circumstances, events or developments which hereafter may be brought to our attention and which may alter, affect or modify the opinion expressed herein. Our opinion is expressly limited to the matters set forth above and we render no opinion, whether by implication or otherwise, as to any other matters relating to the Company or the Shares, or any other agreements or transactions that may be related thereto or contemplated thereby. We are expressing no opinion as to any obligations that parties other than the Company may have under or in respect of the Shares or as to the effect that their performance of such obligations may have upon any of the matters referred to above. No opinion may be implied or inferred beyond the opinion expressly stated above.