Negative pressure draining device and using method thereof

The invention relates to a negative pressure draining device. The draining device comprises a draining tube, a flushing tube, medical gauze, hydrocolloid oil yarns, a medical membrane dressing and a Y-shaped three-way valve, the front ends of the draining tube and the flushing tube are sealed, the rear ends of the draining tube and the flushing tube are opened and are connected with the Y-shaped three-way valve, a plurality of side holes are formed in the draining tube and the flushing tube, the outer and inner sides of the draining tube and the flushing tube are covered with the medical gauze, the outer side of the medical gauze is provided with the medical membrane dressing, and the inner side of the medical gauze on the inner side is provided with the hydrocolloid oil yarns. The negative pressure draining device has the advantages that effective flushing and draining are achieved by the flushing pipe and the draining pipe, wound surface secretion and necrotic tissues are dischargedout of the body through t