Under the background of insufficient development of user-side flexible resources, it is necessary to conduct optimization research on the production process of high energy-consuming machining industry. This paper takes the flexible load of the mechanical processing as the starting point, analyzes the corresponding relationship between different equipments and flexible loads by sorting out the electricity consumption characteristics of the mechanical processing, and establishes a calculation model for demand response transactions. On this basis, the photovoltaic-storage synergy model is added to establish a complete demand response oriented mechanical processing production process optimization and solar-storage synergy strategy. This model considers the work constraints of the production equipment corresponding to the flexible load and constraints of the photovoltaic-storage equipment, with the goal of maximizing the total revenue, optimizes the production process of mechanical processing enterprise, and obtains the optimized work flow of the production equipment corresponding to the flexible load, and the maximum benefit that can be obtained. Finally, a copper pipe processing enterprise is used for simulation verification. The calculation example shows that the optimization strategy can effectively improve the economy of the machining industry and increase the consumption rate of new energy.