The invention relates to the field of compounding, and aims at providing a compound machine and a compound method. The compound machine comprises a machine top, a transitional guide roller set, a coating assembly, a compound assembly, a water-cooling assembly, a preheat roll assembly, a tension detection roller set, an electric control cabinet and first and second engine bases respectively arranged at two ends of the machine top, wherein the first engine base is provided with a coating mechanism and a first base material unreeling assembly, the second engine base is provided with a second base material unreeling assembly and a rolling-up assembly, the compound assembly is arranged on the first engine base; the preheat roll assembly comprises a first preheat roller and a second preheat roller used for preheating a first base material and a second base material respectively, and the first preheat roller is arranged on the path for transferring the first base material between the first base material unreeling assembly and the coating assembly. According to the technical scheme, by adjusting the arrangement of key assemblies, the reliability of the compound product is improved, and the production efficiency is improved, so that the compounding machine is suitable for the compounding requirement of modern base materials with flexible package.