A saliva suction system includes a suction head, a container, a pump, a controller and two tubes. The suction head has an outline fitting a lower jaw. The suction head is provided with a plurality of inlet holes and an outlet hole. The inlet holes communicate with the outlet hole. The tubes are separately disposed between the pump and the suction head and between the pump and the container. The controller makes the pump turn on or off. The saliva suction system further includes a timer and a sensor for automatic or intermittent control.
