Pressure control method for two-way flow of pressure test medium

The invention discloses a pressure control method for two-way flow of a pressure test medium, and belongs to the technical field of hydraulic pressure test. The pressure rise control process includes the steps of closing a water outlet stop valve and an unloading valve, opening a water inlet stop valve, making a plunger move to a front dead point and then go back to a back dead point, closing the water inlet stop valve, making the plunger move forward to increase the pressure, and repeating the steps until a target pressure is achieved. In the pressure maintaining control process, if there is a need constant-pressure maintaining, the water outlet stop valve is opened, and the plunger is moved back and forth by a controller according to pressure feedback to make the medium achieve a constant pressure. In the pressure drop control process for controlling the pressure drop process, the water outlet stop valve is opened, the plunger is moved backward, pressure drop is slowed down when the working pressure is equa