For the heat preservative coated copper pipe adopted in the large scale central air conditioner (VRV system), the heat preservative tube with conventional thickness can not have the functions of preserving heat and preventing dew. The super-thick heat preservative coated copper pipe made of WICPE for air conditioner doesn't need to be coated for heat preservation on construction site and its length can be cut freely. This not only reduces time and labor of the project, but also has the qualities of high efficiency, energy conservation, and environmental protection. It is a kind of air-conditioner piping material that can be used for both cooling and heating. This product satisfies the air-conditioner piping requirements for families or even the large scale commercial use in high buildings.