With the development of people's environmental protection concept, the greening of traditional sand casting has become an important research direction, among which frozen composite sand casting is a typical green casting process. In this paper, an experimental study of a typical aluminum alloy bracket was carried out by using the frozen composite casting process. The casting process was analysed by numerical simulation, and an experimental comparison between frozen composite casting and traditional resin sand casting was carried out. The results of casting performance analysis show that the yield strength, tensile strength and elongation of the frozen composite sand mold aluminum alloy sample are increased by 12.4%, 8.8% and 11.1%, respectively, which proves the superiority of the frozen composite casting process.