Medical anti-blocking pipeline assembly and drainage bag

The utility model discloses a medical anti-blocking pipeline assembly and a drainage bag, and relates to pipeline assemblies in the technical field of medical instruments, and the medical anti-blocking pipeline assembly comprises a cover body used for sealing the opening end of a bag body; one end of the suction tube hermetically penetrates through the cover body, and the other end of the suction tube is connected with a negative pressure source; the suction inlet connecting pipe is arranged on the cover body in a sealing and penetrating manner; one end of the drainage tube is sleeved with a flexible sealing cap in a sealing mode, a rubber sleeve is arranged in one end of the sealing cap, and the drainage tube is sleeved with the rubber sleeve; wherein the outer diameter of the end, inserted into the suction inlet connecting pipe, of the drainage pipe is smaller than the inner diameter of the suction inlet connecting pipe, and when the drainage pipe is inserted into the suction inlet connecting pipe, the suct