Water washing system capable of setting pressure for cotton picker

The utility model discloses a water washing system capable of setting pressure of a cotton picker, which belongs to the field of agricultural harvesting equipment and comprises a display screen, an armrest box, a controller, a pulse width modulation (PWM) converter, a mechanical water pump, a sensor, a water pressure regulating valve and a washing component. The display screen, the armrest box and the PWM converter are all in signal connection with the controller, the mechanical water pump, the water pressure adjusting valve and the flushing component are all in signal connection with the sensor, the display screen is used for controlling the controller and displaying information of the controller, and a water pressure adjusting knob is arranged on the armrest box and used for setting target water pressure M1 and transmitting the target water pressure M1 to the controller and the display screen; the controller is used for receiving the target water pressure M1 transmitted by the armrest box and transmitting t