The present invention provides a backlight module, which includes a backplane (2) and a light guide plate (4), a backlight source (6), a mounting bracket (8), a quantum dot rail (10), and a heat isolation member (12) mounted in the backplane (2). The quantum dot rail (10) is fixedly mounted, via the mounting bracket (8), between the light guide plate (4) and the backlight source (6). The mounting bracket (8) is made of an aluminum material. The heat isolation member (12) is arranged between the quantum dot rail (10) and the mounting bracket (8). The present invention uses a mounting bracket made of an aluminum material to fix a backlight source for enhancing the effect of heat dissipation and also to fix the quantum dot rail for ensuring a desired effect of fixing and reducing cost. Further, a heat isolation member is arranged between the quantum dot rail and the mounting bracket to prevent the quantum dot rail from being affected by the heat emitting from the backlight source thereby guaranteeing the life span of the backlight module.