A biliary anastomotic fistula is a post-operative complication, and how long it takes to heal depends on the size of the fistula. If the fistula is small, it usually heals in about 30 to 60 days; if it is large, it takes longer. If the diameter of the fistula after the biliary anastomosis is relatively small, the degree of trauma is relatively mild, and the amount of postoperative bleeding is relatively small, the fistula can gradually heal in about 30 to 60 days through timely treatment. But some patients after anastomosis surgery, the diameter of the fistula is longer, easy to bleed after surgery, and there is a sense of pain, and in severe cases may be formed again abscess, then this kind of patient fistula healing time is relatively long, even up to several months. Now that the biliary anastomosis fistula has been done, it is recommended to observe it regularly and make sure that the drainage tube is open. If there is poor drainage, poor healing, etc., it is necessary to seek medical attention and, if necessary, re-operation.