The invention relates to a disc type fast cooling shaping device for a plastic pipe. The device comprises a cooling ring, a sizing outer sleeve and a sizing inner cylinder, wherein cooling water through holes are formed on the cooling ring; a plurality of channel cooling water holes are formed on the sizing inner cylinder; water conveying holes are formed on the sizing outer sleeve; the cooling ring is arranged on the front part of one end of the sizing inner cylinder; the sizing outer sleeve is sleeved on the sizing inner cylinder and fixedly connected with the rear end of the cooling ring; a water conveying ring is formed between the sizing outer sleeve and the sizing inner cylinder; the water conveying holes on the sizing outer sleeve are communicated with the water conveying ring; andthe channel cooling water holes on the sizing inner cylinder sleeved with the sizing outer sleeve are communicated with the water conveying ring. The disc type fast cooling shaping device is characterized in that: the rear end of the sizing outer sleeve is connected and provided with two struts; the strut at the rear end of the sizing inner cylinder is fixedly provided with a plurality of discs and pipe holes are formed on the discs. The disc type fast cooling shaping device has the advantages of improving the cooling shaping speed of the plastic pipe and the production efficiency.