The invention discloses a rail steel plate processing device for rail transit, and belongs to the field of plate processing. The rail steel plate processing device comprises a fixed guide rail, wherein a movable sliding block and a fixed sliding block are mounted on the fixed guide rail, the movable sliding block is slidably connected with the fixed guide rail, the fixed sliding block is fixedly connected with the fixed guide rail, a polishing assembly is fixedly mounted above the fixed guide rail, A material cutting assembly is fixedly installed on one side of the grinding assembly, a dust removal assembly is fixedly installed on the side, away from the material cutting assembly, of one side of the grinding assembly, a feeding assembly is fixedly installed at the top end of the fixed sliding block, a material pulling assembly is fixedly installed at the top end of the movable sliding block, the feeding assembly comprises a fixed table and a stand column, a feeding channel is mounted at the top end of the stand column, steel balls are arranged on the two sides of the feeding channel respectively, and the steel balls penetrate through the inner side and the outer side of the feedingchannel. The steel balls are arranged on the two sides of the feeding channel respectively, so that the feeding friction force is reduced.