The invention discloses a preparation method for a copper-based alloy material used for a bearing. The preparation method comprises the following steps: (1) preparation of raw materials consisting of brass powder, silicon carbide particles, graphite powder and carbon fiber; (2) with the brass powder as a matrix, adding the silicon carbide particles, graphite powder and carbon fiber and carrying out mixing under high-speed stirring so as to obtain a mixture; (3) subjecting the mixture to cold press molding; (4) packaging a molded material obtained after cold press molding by using copper sheet; (5) heating the packaged material to 200 to 250 DEG C so as to allow organic matters in the material to be totally volatilized; (6) subjecting the material in which the organic matters are volatilized to vacuum-pumping and then continuing to heat the material until the material is semi-solid; and (7) maintaining temperature, subjecting the material to thixoforming after the interior and exterior temperature of the material becomes uniform, and then carrying out cooling to room temperature so as to obtain the copper-based alloy material. The method provided by the invention improves the mechanical properties of copper alloy, thereby better meeting load requirements of a heavy-load sliding bearing.