EXHIBIT 5.1

Law Offices of Thomas E. Puzzo, PLLC

3823 44th Ave. NE

Seattle, Washington 98105

Tel: (206) 522-2256 / Fax: (206) 260-0111 / E-mail: tpuzzo@msn.com

July 10, 2015

VIA ELECTRONIC TRANSMISSION

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Re:

CGN Nanotech, Inc., a Nevada corporation;

Registration Statement on Form S-1

Ladies and Gentlemen:

We have acted as counsel to CGN Nanotech, Inc., a Nevada corporation (the “Company”), in connection with the registration statement on Form S-1 (the “Registration Statement”), filed by the Company with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended (the “Securities Act”), for the registration, offer and sale of up to 1,000,000 shares (the “Shares”) of common stock, par value $0.0001 per share, of the Company.

We have examined the originals, photocopies, certified copies or other evidence of such records of the Company, certificates of officers of the Company and public officials, and other documents we have deemed relevant and necessary as a basis for the opinion hereinafter expressed. In such examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as certified copies or photocopies and the authenticity of the originals of such latter documents.

Based on our examination mentioned above, we are of the opinion that the Shares being sold pursuant to the Registration Statement are duly authorized and will be, when issued in the manner described in the Registration Statement, legally and validly issued, fully paid and non-assessable.

We hereby consent to the filing of this opinion as Exhibit 5.1 to the Registration Statement and to the reference to our firm in the related Prospectus. In giving the foregoing consent, we do not admit that we are in the category of persons whose consent is required under Section 7 of the Act, or the rules and regulations of the Securities and Exchange Commission.

CGN Nanotech, Inc. S-1/A