The invention discloses an inflation and deflation integrated valve for an emptying pump pressure plate for a barrel. The inflation and deflation integrated valve comprises an emptying pump barrel body, the barrel body is provided with the pressure plate, the pressure plate is sleeved with a cylindrical valve body, a movable valve element is arranged in the valve body, an upper opening of the tubular valve body is connected with a valve cover, the valve cover is provided with an inflation and deflation port, the inside of the valve body is divided by a partition plate into upper and lower cavities, the valve element penetrates through a valve element hole in the partition plate, the upper and lower parts of the partition plate are provided with limiting pieces, the lower end of the valve element is a sealing end panel used in cooperation with a lower opening of the valve body, a T-shaped or crossed-shaped vent hole is formed in the valve element, and the upper and lower cavities are communicated. By means of the inflation and deflation integrated valve, only one valve body is used, the number of manual operation is decreased, and the valve is more convenient to use. The valve is closed after deflation, the valve is opened after inflation, the pressure plate descends, pneumatic operation is automatically completed, no manual participation is needed, the contact between a mediumand the human body is avoided, and the safety of the device is strengthened.