The development of cold forging technology is mainly to develop high value-added products and reduce production costs. At the same time, it is constantly infiltrating or replacing it in the fields of cutting, powder metallurgy, casting, hot forging, sheet forming, etc. The combination of processes constitutes a composite process. Hot forging-cold forging composite plastic forming technology is a new precision metal forming process combining hot forging and cold forging. It makes full use of the advantages of hot forging and cold forging: good metal plasticity in hot state, flow stress Low, so the main deformation process is done with hot forging; the precision of cold forgings is high, so the important dimensions of the parts are finally formed by cold forging. Hot forging-cold forging composite plastic forming technology appeared in the 1980s and has been used more and more widely since the 1990s. Parts manufactured with this technology have achieved good results with improved precision and reduced cost.