Self-discharging type common bile duct built-in drainage dilation catheter

The invention relates to the technical field of medical supplies, in particular to a self-discharging type common bile duct built-in drainage dilation catheter. The catheter comprises a curved tube, a first drainage pipeline, a second drainage pipeline, an absorbable line and a push rod. Before use, a disposable urinary tract guide wire is inserted into a duodenum from a choledochoscope operation channel and withdraws from a choledochoscope, and then, is placed in the common bile duct along the guide wire. The bent section is pushed into the duodenum ODeldrial sphincter by using the push rod, a absorbable suture line at the tail end of the second drainage pipeline section is sutured at the open end of the common bile duct, and the catheter is fixed. After the absorbable suture line is absorbed by the human body, when a patient can eat food, the absorbable suture line is pushed by the food, so that the patient can eat the food. By means of the catheter, the catheter can be automatically discharged in a defecat