Can the patent number of utility model continue to be marked on the product after ten years?

This is not allowed by law.

Article 84 of the Detailed Rules for the Implementation of the Patent Law: The following acts are acts of counterfeiting patents as stipulated in Article 63 of the Patent Law:

(1) Marking a patent mark on a product or its packaging that has not been granted a patent right, and continuing to mark the patent mark on the product or its packaging after the patent right is declared invalid or terminated, or marking the patent number of others on the product or its packaging without permission;

Article 63 of the Patent Law: Anyone who counterfeits a patent shall bear civil liability according to law, and the administrative department for patent affairs shall order him to make corrections and make a public announcement, confiscate his illegal income, and may concurrently impose a fine of less than four times his illegal income; If there is no illegal income, a fine of less than 200,000 yuan may be imposed; If a crime is constituted, criminal responsibility shall be investigated according to law.