The invention provides a multilayer composite heat conducting plastic pipe, which is characterized in that the pipe wall is compounded by three materials with different ingredients, the three materials with different ingredients have different functions, a polyethylene plastic layer with good corrosion resistance is mainly arranged on the inner surface of the pipe wall, a polyethylene plastic layer with strong scratch resistance is arranged on the outer surface of the pipe wall, a polyethylene plastic layer with high heat conductivity is mainly arranged in the middle part of the pipe wall, the multilayer composite heat conducting plastic pipe overcomes the defects of reduced corrosion resistance if a single-ingredient single-layer heat conducting plastic pipe utilizes a metal heat conducting modifier, surface dyeing generation on the pipe wall surface when utilizing an inorganic powder heat conducting modifier and fiber exposure on the pipe wall surface when utilizing a metal fiber or an inorganic fiber heat conducting modifier, the pipe can be directly used as the heat exchange pipe of a soil source heat pump, a water source heat pump and a radiation heat supply system to improve the heat transfer capability of the system, and the pipe can be welded and processed to heat exchanges with different forms and different structures to be extensively applied in chemical industry, food and medicine manufacturing process.