The popularization and application of computer information technology has promoted the progress of mankind, from the era of mechanization into the era of information technology. With the development of economic construction, the demand for mechanical equipment and mechanical products continues to increase, computer technology plays an inestimable role in various fields, the machinery industry is no exception, the application of computer technology in the machinery industry to improve the efficiency of production, reduce production costs, and promote the realization of mechanical automation production. This paper analyzes the application of computer technology in mechanical design and manufacturing and its automation.