In this paper, gallium-based liquid metal (GLM) was coated with covalent organic framework polymers (COFs) with porous structure and good organic compatibility, and GLM@COFs solid-liquid composite lubricating microcapsules were prepared, and the GLM@COFs/PI composite coating was prepared by adding them to polyimide (PI). The results show that the spherical structure of GLM@COFs-solid-liquid composite lubrication microcapsules has been successfully prepared. When the GLM@COFs addition amount (mass fraction) was 0.9%, the tribological properties of the GLM@COFs/PI composite coating were the best, with the friction coefficient and volume wear rate of 0.22 and 6.3×10-6 mm3/(N·m), respectively. Compared to PI coating, it was reduced by 35.3% and 61.1%, respectively. This is mainly due to the fact that COFs-coated GLM can not only effectively improve the compatibility between GLM and PI matrix, but also effectively play the role of synergistic friction reduction and wear resistance between COFs and GLM.