The automobile industry is the first industry to adopt additive manufacturing. It integrates 3D printing system into production workshops all over the world, so as to realize rapid prototyping of engine, transmitter components, gearbox shell and other components. Application products include cylinder head, intake manifold and engine set. The technology is also used in the engine development cycle of passenger cars and racing engines. Additive manufacturing in the automotive industry has obvious advantages. The design changes of the prototype engine can be implemented quickly and effectively; the designer can carry out a comprehensive test on the actual casting in a few days. It can integrate sand mold and sand core part, so as to shorten preparation time and improve casting performance. Unique rigging geometry can be added to improve the stability of the casting.