Pressure-stabilizing type inner spiral plastic pipe for building drainage vertical pipe

The invention discloses a pressure-stabilizing type inner spiral plastic pipe for a building drainage vertical pipe. The pressure-stabilizing type inner spiral plastic pipe comprises a pipe body, a main blade and an auxiliary blade, wherein the pipe body is a cylindrical plastic drainage pipe, the main blade and the auxiliary blade are spiral blades coaxially arranged in the axial direction of thevertical pipe on the inner wall of the pipe body, and the joint between root parts of the main blade and the auxiliary blade and the inner wall of the pipe body is an arc excessive structure, and thecommensurate included angle between the main blade and the auxiliary blade is between 80 degrees and 130 degrees. According to the pressure-stabilizing type inner spiral plastic pipe for the buildingdrainage vertical pipe, 80% of water flow is borne by the main blade, and 20% of the water flow is borne by the auxiliary blade, so that good wall-attached spiral water flow is still formed during large drainage amount; and me