During the bending process of the hydraulic sheet metal bending machine, the hydraulic system drives the bending mold to move and bend the sheet metal into the desired shape. The bending mold can adjust the angle and shape as needed to meet the bending needs of different sheet materials. It has the characteristics of high precision, high efficiency, and can complete a large number of workpiece processing in a short time. In addition, due to the characteristics of the hydraulic system, it can easily handle the deformation of sheet metal and the processing of irregular workpieces.