The invention relates to an assistant vehicle, in particular to a space-saving treatment assistant vehicle for ophthalmology department. The space-saving treatment assistant vehicle can reduce occupied space, can receive enough illumination and is high in stability. The space-saving treatment assistant vehicle comprises a mounting frame, rollers, a first placement frame, mounting rods, a fixing block, a first bearing seat, a threaded rod, a handle and a first nut, the rollers are rotatably connected on front, rear, left and right sides of the bottom of the mounting frame, and the mounting rodsare connected on the left and right portions of the rear side of the top of the mounting frame. The space-saving treatment assistant vehicle has the advantages of being capable of reducing occupied space and receiving enough illumination and high in stability. By arranging the threaded rod and a second connection rod, space saving effect is realized. By arranging a friction block, the space-saving treatment assistant vehicle can be fixed, so that effect of improving stability is realized; by shaking a swinging rod, sound can be generated by a wind bell, in this way, convenience is brought tothe assistant vehicle to go through populations.