Disclosed is a multifunctional negative pressure drainage system which can quickly switch among continuous negative pressure, intermittent negative pressure, rinsing, dosing, cyclic dosing and other modes for a patients wound position. It comprises a medical dressing (1), a waste bottle (23), a vacuum pump (25), an A flow guiding pipe (21), an A air guiding pipe (24), a B flow guiding pipe (31), a peristaltic pump (32), a C flow guiding pipe (33), an infusion bottle (34), a E flow guiding pipe (61), an A control valve (22), a B control valve (35) and an F control valve (62), wherein the medical dressing (1), the B flow guiding pipe (31), the peristaltic pump (32), the C flow guiding pipe (33) and the infusion bottle (34) are sequentially connected, the medical dressing (1), the A flow guiding pipe (21), the waste bottle (23), the A air guiding pipe (24) and the vacuum pump (25)are sequentially connected, the E flow guiding pipe (61) is connected between the C flow guiding pipe (33) and the A flow guiding pipe (21), the A control valve (22) is arranged on the A flow guiding pipe (21), and the connection point of the E flow guiding pipe (61) and the A flow guiding pipe (21) is located between the A control valve (22) and the medical dressing (1), the B control valve (35) is arranged on the C flow guiding pipe (33), and the connection point of the E flow guiding pipe (61) and the C flow guiding pipe (33) is located between the B control valve (35) and the peristaltic pump (32), and the F control valve (62) is arranged on the E flow guiding pipe (61).Linvention concerne un système multifonctionnel de drainage à dépression qui peut rapidement commuter entre les modes dépression continue, dépression intermittente, rinçage, dosage, dosage cyclique et dautres modes pour une position de blessure du patient. Il comprend un pansement médical (1), une bouteille à déchets (23), une pompe à vide (25), un tuyau de guidage découlement A (21), un tuyau de guidage dair A (24), un tuy
