A negative-pressure suction apparatus comprising a suction tube (1), a negative pressure source (2), a mesh hood (3), a mount base (4), and a tube core (6). A flow channel (11) having the two ends thereof configured as openings is formed at the middle of the suction tube (1). The external contour of the flow channel (11) is trumpet-shaped, and the small end thereof is connected to the negative pressure source (2). The mesh hood (3) is mounted onto the mount base (4). The mesh hood (3) completely covers the end face of the large end of the flow channel (11). A slide hole (41) is formed at the middle of the mount base (4). The suction tube (1) is sleeved into the slide hole (41). A soft connection strip (5) is arranged between the mesh hood (3) and the suction tube (1). The tube core (6) is arranged within the flow channel (11) of the suction tube (1). The external contour of the tube core (6) is configured into a stepped shape, and the small end thereof faces the mesh hood (3). Another spiral protrusion (63) is arranged on the outer wall of the tube core (6). Another flow channel (61) is formed in the middle of the tube core (6). The top end of the other flow channel (61) is sealed, while the bottom end is configured as an opening. The sidewall of the tube core (6) has formed several liquid permeation holes (62) in communication with the other flow channel (61). The bottom end of the other flow channel (61) is connected to the negative pressure source (2 and 21). The negative pressure suction apparatus facilitates drainage of wound effusion and blood clots, and, during a drainage process, prevents the negative pressure from causing damages to tissues and organs in contact with a suction opening.La présente invention concerne un appareil daspiration par dépression comprenant un tube daspiration (1), une source de dépression (2), une hotte maillée (3), un support de montage (4) et un tube noyau (6). Un canal découlement (11) dont les deux extrémités sont conçues comme
