A grading device for PVC paste resin products is formed by connecting a spray drying tower, a first bag filter, a vibration screen, a powder collection tank, a grader, a second bag filter A, a screw conveyor, a second powder collection tank, a pulverizer and a second bag filter B in sequence. By using the grading device for the PVC paste resin products, 80 percent of dried PVC paste resin powder does not need pulverizing, powder roundness and other parameters are good, the post-processing performance of the products is good, and the products can be sold as one special material for gloves; meanwhile, 20 percent of post-grading coarse powder can meet the requirement of product processing through only one pulverizer, the pulverized powder is sold as the other special material, and therefore the number of grinding mills is greatly reduced. The grading device has the advantages that the number of the equipment is small, grading accuracy is high, cutting grain sizes are convenient to adjust, energy is saved, consumption is lowered, and economic benefits are high. Besides, the grading device can be applied to the product grading process of a PVC paste resin drying system.