The utility model comprises a needle tube (1), a double-cavity plastic tube (2), clips (3), a sealing plug (4), a drainage tube (5), a Murphy's dropper (6), a control switch (7), a drainage bag (8) and a draining plug (9). When in puncture, the two clips (3) are closed and air cannot enter the abdominal cavity. When in drainage, the clips (3) connected with the drainage tube (5) are unfolded, the control switch (7) is regulated, and the draining speed is controlled by looking at the Murphy's dropper (6). In case of unsmooth drainage and the demand on feeding the medicine, a 20ml needle tube with a needle head is inserted into the sealing plug (4) and physiological saline is poured into for washing the needle hole or the medicine, therefore the continuous peritoneal irrigation is underway. After the drainage bag (8) is filled fully, the draining plug (9) is pulled out and the drainage liquid is released to continuously drain.