The invention discloses a backlight module which comprises a light source, a heat radiating plate, a backing plate and an elastic fixture, wherein the light source is arranged on the heat radiating plate; the heat radiating plate is arranged on the backing plate; the heat radiating plate is provided with a first open pore; the backing plate is provided with a second open pore; the second open pore and the first open pore are overlapped; the elastic fixture passes through the first open pore and the second open pore, and clamps two far sides of the heat radiating plate and one side of the backing plate to fix the heat radiating plate on the backing plate. By the invention, the heat radiating plate can be assembled on the backlight module provided by the invention quickly.