A backlight module and a display device are provided. The backlight module includes a back cover, a support plate, a plastic frame, an engaging member, and a film assembly. The back cover includes a bottom cover and a side cover. The side cover is connected with a periphery of the bottom cover. The side cover and the bottom cover cooperatively define an accommodation space. The support plate is connected with the side cover. The plastic frame includes a side wall and a top wall. The side wall is connected with a periphery of the top wall. The engaging member is located between the support plate and the top wall, and connected with the support plate or the top wall. The film assembly is mounted in the accommodation space. The film assembly includes a film assembly body and a tab.