The invention relates to a surface treatment device and treatment method for PVC plastic parts. The surface treatment device comprises a bottom plate, a top frame, a grinding device, a clamping deviceand a conveying device. The bottom plate is provided with the top frame, the grinding device is installed at the lower end of the top frame, the clamping device is arranged at the lower end of the grinding device, the conveying device is arranged on the inner side of the clamping device, and the clamping device and the conveying device are both installed on the bottom plate. The conveying devicecomprises connecting frames, a driving motor, a conveying plate, a supporting column, placing seats, blocking plates, a pushing frame and receiving boxes. The surface treatment device for the PVC plastic parts can solve the problems that existing PVC cylindrical plastic parts have low working efficiency, high manual dependence degree, high working cost, small use range and the like in the grindingprocess, can realize the function of automatic grinding of the PVC cylindrical plastic parts, and has the advantages of improving the work efficiency, reducing the manual dependence degree, reducingthe work cost, expanding the use range and the like.