UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number 001-42286

ZJK Industrial Co., Ltd.

No.8, Jingqiang Road, 138 Industrial Zone,

Xiuxin Community, Kengzi Town,

Pingshan New Area, Shenzhen

People’s Republic of China, 518122

+86-0755-28341175

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

EXPLANATORY NOTE

ZJK Industrial Co., Ltd. (the “Company”) is furnishing this Form 6-K to provide (i) unaudited consolidated financial statements for the six months ended June 30, 2025 and 2026 and related notes, attached hereto as Exhibit 99.1, (ii) operating and financial review and prospects for the six months ended June 30, 2025 and 2026, attached hereto as Exhibit 99.2, and (iii) press release titled “ZJK Industrial Co., Ltd. Reports Financial Results for First Half of Fiscal Year 2026,” attached hereto as Exhibit 99.3.

Incorporation by Reference

This Form 6-K is hereby incorporated by reference into (i) the Company’s registration statement on Form S-8 (File No. 333-288383) filed with the SEC on June 27, 2025 and (ii) the Company’s registration statement on Form F-3 (File No. 333-293519) that was initially filed with the SEC on February 17, 2026 and declared effective by the SEC on March 27, 2026.

Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

Date: September 21, 2026