The invention discloses an oral clinical cleaning spraying washing device. The device comprises a base, the base is provided with a lifting hydraulic cylinder device, the upper end of the lifting hydraulic cylinder device is provided with a seat, the back side of the seat is hinged to a backrest plate, an electric push rod is mounted on the back side of the head end of the backrest plate, the electric push rod is connected to a head fixing device, a processing box is arranged on one side of the base, a medicine mixing box is arranged in the processing box, a transfusion pump is connected to the medicine mixing box, the transfusion pump is connected to a medicine pretreatment box, a water tank is mounted in the processing box, a second heating device is mounted in the water tank, an ultraviolet sterilization lamp is mounted on the upper end of the inside of the water tank, the water tank is connected to a second liquid discharging pump, and the second liquid discharging pump is connected to a second liquid discharging joint. The device meets the use requirements of current oral clinical treatment, has convenient adjustment and convenient fixation, and can achieve cavity diversification cleaning and spraying washing.