The invention discloses a duct anti-reflux stent. The duct anti-reflux stent comprises a stent body and a flap module, wherein the flap module is composed of permanent magnet flaps and milled steel flaps, which are connected in a sealed mode to the stent body through hinges, both the permanent magnet flaps and the milled steel flaps are in a pedal structure and are symmetrically arranged, the connecting parts of the permanent magnet flaps and the milled steel flaps are provided with fixed filling flaps which are tightly attached to the inner surfaces of the permanent magnet flaps and the milled steel flaps; insulating membranes are adhered to the inner surfaces of the milled steel flaps, an S-shaped coil is arranged in a sealed mode inside the insulating membranes; the inner surface of thestent body is provided in a sealed mode with upper contacts and lower contacts at intervals, one end of the S-shaped coil is electrically connected with the lower contact, and the other end of the S-shaped coil is electrically connected with the upper contact. According to the duct anti-reflux stent, the permanent magnet flaps, the milled steel flaps and the fixed filling flaps can be fully closed to prevent liquid downstream a bile duct from refluxing upstream the bile duct; when the liquid upstream the bile duct immerses the upper contact and the lower contact, the flap module can be fullyopened so that the liquid upstream the bile duct to rapidly pass through the flap module. The duct anti-reflux stent is good in liquidity and capable of effectively avoiding agglomeration of the upstream liquid at the flap module.