Abstract: Lubrication-reinforcement bifunctional microcapsules PTFE@Al(OH)₃ using polytetrafluoroethylene (PTFE) as the core material and Al(OH)₃ as the shell material were prepared by in-situ polymerization of sodium bicarbonate and aluminum sulfate solutions. Its surface was treated with vinyl trimethoxysilane (VTMS) and used as a reinforcing filler for ultra-high molecular weight polyethylene (UHMWPE). After it was evenly mixed, processed into composite materials using spark plasma sintering (SPS). The dispersion properties of microcapsules in the matrix, tribological properties and mechanical properties of composite materials were characterized by SEM, TEM, FTIR, universal micro tribometer (UMT-5), three-dimensional white light interferometer and methods of tensile compression testing machine. It is demonstrated that the addition of microcapsules effectively improve the tribological properties (friction coefficient decreased by 35%, wear amount decreased by 20%) and mechanical properties (compression strength increased by 2.5 times) of the composites. In addition, the dispersibility of the microcapsules is also greatly improved by surface modification.