Backlight module and display device

The utility model discloses a backlight module and a display device, the backlight module comprises a back plate, a bottom plate of the back plate is in an equilateral m-edge shape, m side plates in the bottom plate and the bottom plate enclose an accommodating space, and m is an integer greater than or equal to 3; the light guide plate is located in the containing space, the light guide plate comprises m side faces opposite to the m side plates in a one-to-one mode, a preset gap is formed between the side face of each light guide plate and the opposite side plate, the m side faces are divided into n connected first side faces and m-n connected second side faces, and n is an integer larger than or equal to 1 and smaller than or equal to m/2; and the n lamp strips are located in the preset gaps, the n lamp strips and the n first side faces are arranged in a one-to-one opposite mode, light inlet gaps are formed between the lamp strips and the light guide plate, the sides, provided with the light sources, of the lamp strips are opposite to the light guide plate, and the sides, away from the light guide plate, of the lamp strips are fixedly connected with the side plates. According to the backlight module, the expansion space of the light guide plate can be guaranteed, meanwhile, the light-in gap can be reduced, and the light-in efficiency is improved.