The invention provides an environment-friendly method for prolonging the service life of a face milling cutter based on heat pipe phase changes, so durability of the face milling cutter can be remarkably improved under a milling especial for high-speed milling machining condition. The method comprises a novel face milling cutter. The novel face milling cutter comprises a heat pipe, a face milling cutter shank, a face milling cutter body and a face milling head. The face milling head is arranged at one end of the face milling cutter body, the face milling cutter shank is arranged at the other end of the face milling cutter body, the heat pipe is implanted into the face milling cutter body from the face milling cutter shank in the direction parallel with the axis of the face milling cutter body and is close to the main cutting edge part on the face milling head, and the heat pipe is filled with a liquid absorption core. Heat pipe phase change heat transferring is adopted in the method, so the heat pipe is higher than cutting fluid in heat transfer efficiency. A heat pipe technology is adopted, the cutting temperature of the face milling cutter is lowered, the heat pipe is more environment-friendly than the cutting fluid, and personal injuries to operation staff do not exist. In addition, the heat pipe adopted in the method is cheaper than the cutting fluid in market price, and therefore manufacturing cost of products of enterprises can be reduced.