The invention discloses a plastic brick comprising a plastic brick body and a supporting body arranged on the lower portion of the plastic brick body. The plastic brick body comprises a rubber layer, a flame retardant layer and a waterproof layer from up to bottom. A splicing clamping piece is arranged on one side of the supporting body, and a splicing clamping groove is formed in the other side of the supporting body. The plastic brick is not liable to fracture.