Cooling device of plastic corrugated pipe extruder

The invention discloses a cooling device of a plastic corrugated pipe extruder, which is characterized in that a first mold assembly is provided with a first cooling cavity in the thickness direction, the top of the first cooling cavity is provided with at least one first liquid adding port, and the middle part and/or the lower part of the first cooling cavity is provided with at least one first liquid outlet; the first filling assembly comprises at least one first filling port, and the first filling port corresponds to the first liquid filling port; according to the cooling device of the plastic corrugated pipe extruder, all the first cooling cavities are filled through the first filling assembly, and the structural complexity of the first filling assembly is simplified; the gradual heat exchange process is continuously carried out after the cooling liquid just enters the first mold assembly; in the basic forming process of the plastic corrugated pipe, the temperature difference between the first mold assemb