The invention discloses a high-sealing-performance and corrosion-resistant nonmetal compensator. The high-sealing-performance and corrosion-resistant nonmetal compensator comprises an inlet connecting pipe, bolt modules, press boards, a nonmetal thin-wall sleeve and an outlet connecting pipe. The opposite ends of the inlet connecting pipe and the outlet connecting pipe are provided with a radial flange, both ends of the non-metal thin-wall sleeve are bent outwards, and the non-metal thin-wall sleeve is connected to the end surfaces of the radial flange of the inlet connecting pipe and the outlet connecting pipe in a sealed mode through the bolt assemblies and the press boards to compose a compensating structure. The high-sealing-performance and corrosion-resistant nonmetal compensator is characterized in that the inner surfaces of the inlet connecting pipe and the outlet connecting pipe are provided with wear-resisting layers. The high-sealing-performance and corrosion-resistant nonmetal compensator significantly improves the wearing resistance of the inner surfaces of the inlet connecting pipe and the outlet connecting pipe, thereby effectively prolonging the service life.