Abstract: A film, a backlight module and a display device are provided. The film includes: a first body having a platy structure, a protrusion protruded from an edge of the first body in a plane where the first body is located, and a positioning structure intersected with one surface of the protrusion wherein the positioning structure includes a second body and one or more openings; the second body includes a blocking portion and a connecting portion; the blocking portion is connected with the protrusion through the connecting portion; and the one or more openings are disposed between the blocking portion and the protrusion.