The invention provides a wear-reducing-particle-premixed bearing bush and a processing method thereof. The processing method includes the following steps: (a) adding graphite particles in preset targeted particle size to a metal solution, and treating the metal solution with addition of the graphite particles through ultrasound wave to uniformly mixing the graphite particles with the metal solution; (b) performing continuous casting and rolling to the uniformly mixed metal solution to form a metal sheet structure; (c) fixing a steel plate with the metal sheet structure integrally, and performing stamping to form a bearing bush billet; and (d) performing fine processing to the surface of the bearing bush billet to obtain a finish product of the bearing bush. According to the processing method, a process of premixing the wear-reducing particles is employed to replace an on-situ particle generation method, so that reduction on performances, such as embedability, flexibility, plasticity and the like, of a substrate material due to alloy elements brought by the on-situ particle generation method can be avoided. The graphite particles are directly embedded in alloy, so that the bearing bush processed through the method is better in bonding strength and dispersion property.