The invention discloses a method for preparing a swash plate based on bismaleimide. The method comprises the steps of preparing a bismaleimide/diallyl bisphenol A copolymer, preparing a wear-resistant coating, spraying and curing, wherein the wear-resistant coating is prepared from the following ingredients in parts by mass: 40-60 parts of bismaleimide/diallyl bisphenol A copolymer, 20-50 parts of PTFE (Polytetrafluoroethylene), 10-30 parts of molybdenum disulfide, 5-10 parts of graphite fluoride and 1-10 parts of reinforcing material nano aluminum oxide. According to the method for preparing the swash plate based on bismaleimide, disclosed by the invention, the wear-resistant coating is reasonable in composition and excellent in heat resistance and adhesion, thus the swash plate based on the wear-resistant coating has excellent wear resistance, has the friction performance, which is far superior to that of the existing swash plates prepared from resin regardless of whether the swash plate is in a dry state or oil state, and can meet the needs of an automotive air conditioner compressor.