Combined type multifunctional drainage device

The utility model relates to a combined type multifunctional drainage device which belongs to the technical field of medical appliance and comprises a main tube and an inner sleeve, wherein the main tube consists of an endoscopic operation tube, a liquid inlet tube and a drainage tube, an outer port of the endoscopic operation tube takes on a horn shape, the liquid inlet tube is inserted into the endoscopic operation tube, and the tube wall at one side of the liquid inlet tube is connected with the inner wall at one side of the endoscopic operation tube; the drainage tube is communicated with the tube wall at the outer end of the endoscopic operation tube; the inner sleeve consists of an inner tube, a washing tube and a piston, the piston is fixedly sheathed on the tube wall of the outer port of the inner tube, the endoscopic operation tube and the tube wall of an inner port of the inner tube are respectively provided with a plurality of liquid inlet holes, the piston is provided with a through hole, and the