Abstract: The structure of the hammer crusher is simple, easy to use, and widely used in industries such as metallurgy and mining. The hammer head consists of a hammer handle and a hammer end. During use, the hammer handle was required to have a certain toughness, and the hammer end was required to have high wear resistance. In order to make different parts of the hammer head have different performance, a double-liquid double-metal composite hammer head was produced using a side pouring method. The Procast software was used to simulate the filling and solidification process of the double-liquid double-metal composite hammer head, and the hammer head was subjected to heat treatment. The microstructure, diffusion behavior of elements and hardness of the composite hammer head were systematically studied using XRD, SEM, TEM and microhardness tester. The results show that the temperature change during the solidification process of the side pouring system is uniform and the filling is stable. By reasonably matching the casting and heat treatment process parameters, the casting defects are effecti vely improved. The high chromium alloy at the hammer end has a martensitic structure, distribute with a ske letal carbide and（Fe, Mn）₃C alloy carbide structure, while the carbon steel at the hammer handle mainly consists of bainite and fine tempered troostite. The hardness at the high chromium end of the hammer reaches 57.65 HRC, and the hardness of the carbon steel hammer handle is 26.74 HRC.