A bile duct stent and a method of manufacturing the same are disclosed. The bile duct stent having a backflow preventing means according to an embodiment of the present invention includes: a cylindrical body having a mesh structure formed by zigzagging metal wires of a shape memory alloy on a plurality of pins each disposed in a circumferential direction X and a longitudinal direction Y of a cylindrical jig; a film portion coated on cells of the metal wires of the mesh structure; and a backflow-preventing pattern film in which a hole is formed in the film portion of each cell formed at an outlet end of the cylindrical body and threads (Lasso) fixed by zigzagging to the cells of the metal wires in the circumferential direction by passing through any one hole (h) cross the outlet end one time or more to form a network structure.