The invention provides a powder metallurgy method. Raw materials comprise, in percentage by weight, 1.2% of a lubricating agent, 3.1-3.2% of copper, 3.2-4.1% of zinc, 1.3% of ethylene, 0.2% of an annexing agent and the balance aluminum and impurities difficult to remove, and the raw materials are squeezed and smashed; and powder ingredients are stirred and mixed at the high temperature of 230-310DEG C, then subjected to pressure casting, cleaned by hot water, subjected to rust removal treatment, screened and dried. By means of the powder metallurgy method, the production cost is greatly lowered, and the product prepared by the powder metallurgy method is long in service life and high in hardness.