NOVELTY - Polyurethane-based interpenetrating network alloy heat-conducting wear-resisting material as bearing inner layer material is prepared using butylene glycol, dibutyl tin laurate, methyl methacrylate, styrene, peroxide and dimethylaniline. Polypropylene group high-rigidity heat-conducting composite material as bearing outer layer material is prepared. The bearing inner layer material and bearing outer layer material are subjected to extrusion molding, and then cut mechanically, to obtain double-layered composite polymer-based wear-resisting bearing.    USE - Preparation of double-layered composite polymer-based wear-resisting bearing used for industries of shipping, hydroelectricity, wind power and wave power generation.    ADVANTAGE - The light weight double-layered composite polymer-based wear-resisting bearing having improved heat resistance, thermoplastic deformability, durability and working temperature, is economically prepared with high accuracy.    DETAILED DESCRIPTION - Toluene diisocyanate is added to polyethylene glycol adipate in mass ratio of 40-65:35-60 under the protection of nitrogen, and reacted at 70-80 degrees C for 2-3 hours, to obtain pre-polymer of polyurethane. The polyurethane pre-polymer, aramid fiber, heat-conducting graphite powder, butylene glycol, dibutyl tin laurate, methyl methacrylate, styrene, peroxide and dimethylaniline are mixed in mass ratio of 50-55:5-10:15-20: 2:2:10:10:2 under stirring, reacted at 25-100 degrees C for 6-24 hours, and decompressed under reduced pressure for 4 hours, to obtain polyurethane-based interpenetrating network alloy heat-conducting wear-resisting material as bearing inner layer material. Polypropylene, maleic anhydride modified polypropylene, maleic anhydride modified ethylene-octylene copolymer, carbon fiber of high heat conductivity, heat-conducting graphite powder and nano-sized heat-conducting carbon powder are mixed uniformly in mass ratio of 54:59:8:8:10-15:10-15:5 at 160-220 degrees C, melted, extruded, and granulated, to obtain polypropylene group high-rigidity heat-conducting composite material as bearing outer layer material. The bearing inner layer material and bearing outer layer material are subjected to extrusion molding together by a double-layer plastic pipe extruding molding unit at 160-220 degrees C, and then cut mechanically, to obtain double-layered composite polymer-based wear-resisting bearing.