The utility model provides a multi -functional silicon gel negative pressure drainage device, include: the dressing body, with the drainage mechanism and the negative pressure source of this body coupling of dressing, the dressing body includes by last polyurethane film, absorbed layer, filter layer and the glue film that down sets up according to the preface, and one side that the double - sided adhesive layer of glue film for having the air vent, double - sided adhesive layer and filter layer are connected is medical pressure sensitive adhesive, the another side be can with the silicon gel of people's body coupling, polyurethane film's lower surface also is equipped with medical pressure sensitive adhesive, and polyurethane film's the outer fringe and the outer fringe adhesion of glue film make absorbed layer and filter layer cladding between polyurethane film and glue film, the both sides of glue film are equipped with first handheld limit and the handheld limit of second respectively, are provided with a plurality of edges of a knife on the glue film, a plurality of edges of a knife dislocation evenly distributed, and when the handheld limit of first handheld limit and second was drawn back to both sides, the edge of a knife formed the infiltration area who has the rhombus space. The utility model discloses a seal is good, the drainage is efficient, helps the wound to heal up sooner.