The invention belongs to the technical field of solid particle removing of catalytic cracking oil slurry, and particularly relates to a method for removing solid particles in FCC oil slurry. For the technical problems that the sedimentation time of a chemical sedimentation method is too long, additives used are expensive, and the additives used cannot be applied to different oil slurry systems, the invention proposes the method of treating the oil slurry with an organic solvent and then adding a flocculant for sedimentation of the solid particles, and the method is simple to operate, does notrequire complicated equipment and chemical additive formulations, can effectively shorten a solid removal time, and improves a solid particle removal rate. The method is applicable to a variety of theFCC oil slurry systems and is of great significance for industrial production.