6-K

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

of the Securities Exchange Act of 1934

FOR THE MONTH OF August 2025

COMMISSION FILE NUMBER: 001-33863

XINYUAN REAL ESTATE CO., LTD.

27/F, China Central Place, Tower II

79 Jianguo Road, Chaoyang District

Beijing 100025

People’s Republic of China

(Address of principal executive offices)

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

Form 20-F x                            Form 40-F ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

XINYUAN Real Estate, Co. Ltd. (the “Company”) announces the following information regarding its blockchain related business:

Since 2016, the Company has made long-term investments in the area of real world asset tokenization for approximately the equivalent of USD 17.4 million. In 2019, Company successfully completed offerings of security tokens backed by real estate property and listed, in 2020, on MERJ Exchange the aforementioned security tokens collateralized by certain real estate property at the Company’s subsidiary’s Oosten project. As of this time, the Company and its affiliates have obtained 99 blockchain related patents in China.

Pursuant to a resolution of the Board of Directors of the Company, the Company intends to continue the development of its blockchain related business within compliance of all applicable laws in relevant jurisdictions.

Exhibit Index

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, thereunto duly authorized.

Exhibit 99.1

XINYUAN REAL ESTATE CO., LTD. (the “Company”)

鑫苑地产控股有限公司

UNANIMOUS WRITTEN RESOLUTION OF THE BOARD OF DIRECTORS OF THE COMPANY MADE ON AUGUST 29, 2025

董事会 2025 年 8 月 29 日书面一致决议

The undersigned, being the directors (collectively, “Directors”, each a “Director”) of board of Directors (“Board”) of the Company acting by written resolutions without a meeting DO HEREBY CONSENT to the adoption of the following resolutions.

董事以书面一致决议的形式批准下列决议。

鉴于资产代币化及相关技术的发展趋势与潜在战略机遇， 经公司董事会审议， 公司 计划全面重启并加速在区块链及 RWA 领域的战略探索与布局，积极推进将房地产等 核心资源与科技金融深度融合的业务模式，致力于在 RWA 领域实现实质性突破与长 远发展。

已决议， 公司将积极评估与区块链产业相关方建立战略合作的可能性， 以尽快实现 将房地产资源与区块链技术相结合的 RWA 业务落地机会。

已决议，公司将与区块链领域的潜在投资方保持沟通，评估通过链上融资等多元化方 式获取增量资金的可行性，以支持公司创新业务的长期发展。

(Signature page to follow, 以下无正文，为签字页)

We, the undersigned, being the Directors, hereby consent to the passing of the foregoing resolution with effect from the date of these resolutions:

我们，以下签字人，作为董事，特此同意自这些决议之日起通过上述决议：