The hydraulic system of the hydraulic press brake machine has high stability, and can achieve four operating speeds of rapid slide down, slow slide down, slow bending close to the workpiece, and fast return to the original position. The positioning adopts the structure of built-in mechanical stopper in the oil cylinder, with high repeated positioning accuracy, the slider stroke and the rear stop distance can be quickly adjusted by the motor, manually fine-tuned, and displayed by the counter. The slider can be stopped in time to ensure the safety performance of the operation. The upper die of the hydraulic bending machine can be equipped with a quick clamping device to shorten the time for changing the die and improve the production efficiency. The upper die has a manual adjustment device to ensure the machining accuracy of the workpiece and the service life of the die.The hydraulic press brake machine is equipped with best configurations,has long service life.