Manufacture method of composite pipeline used for building

The invention belongs to the technical field of a material for a building, and particularly relates to a manufacture method of a composite pipeline used for the building. The manufacture method of the composite pipeline used for the building comprises the following steps of: installing a die; starting an injection molding machine; heating the die to ensure that the die is at the constant temperature; carrying out injection molding; cooling the die; taking out the die; forming an auxiliary channel, a first part of a side wall body, the second part of the side wall and the third part of the side wall; and forming the composite pipeline used for the building. In the step of starting the injection molding machine, even raw material particles are added, comprising the following ingredients in percentage by weight: 5-12% of ethylene, 83-90% of propylene, 2-4% of hexane, 1-2% of octylene, 0.05-2% of calcium carbonate and 1-3% of glass additive. The manufacture method has the following main beneficial effects that the product is easy to manufacture, is small in contraction distortion and creep deformation and easy to overlay, and one pipeline has multiple purposes; and the manufacture method is simple and is easy to grasp.