Provided are a backlight module, a display panel and a display apparatus. The backlight module includes a back plate, including a bottom plate and a frame surrounding the bottom plate; at least one light bar, fixed on an inner sidewall of the frame, wherein a gap is formed between an end portion of the light bar and the inner sidewall of the frame in an extension direction of the light bar; and a reflector sheet, disposed in the frame and on the bottom plate, wherein at least one first sidewall of the reflector sheet is provided with at least one first protrusion, the first protrusion being extended from the first sidewall on which the first protrusion is disposed towards an inner sidewall of the frame opposite to the first sidewall on which the first protrusion is disposed, and the first protrusion being disposed in the gap.