Pump control hydraulic system standby pressure control system, crane and pressure control method

The invention discloses a pump-controlled hydraulic system standby pressure control system, a crane and a pressure control method. The pump-controlled hydraulic system standby pressure control system comprises an electric proportioning pump, a reversing valve, a three-way flow valve, a pressure detection unit, a control unit and a control unit. Through dual adjustment of hydraulic pressure and control, the hydraulic system can be automatically maintained in a standby state and kept in a set pressure state when the crane is in a standby state only by detecting the pressure at one position of an oil outlet of the pump, and when a handle is operated, the system can rapidly build pressure and improve the operation responsiveness of the system; the standby pressure is reasonably controlled, the standby pressure of the pump control crane is controlled within a reasonable range by using fewer sensors, the standby pressure of a system cannot be changed due to the pressure change of a load port, and the problems of st