The disclosure provides a backlight module and a display device. The backlight module comprises a light guide plate having a first surface and a second surface intersecting with the first surface, a first light bar, a second light bar, and first positioning columns. First positioning holes is formed on the first surface. The first light bar comprises a first substrate arranged close to the first surface, first blue emitting diodes arranged on the first substrate, and first quantum dot fluorescent tubes arranged close to the first surface. The second light bar comprises a second substrate arranged close to the first surface, second blue light emitting diodes arranged on the second substrate, and second quantum dot fluorescent tubes arranged close to the second surface. The first positioning columns are arranged between the first quantum dot fluorescent tubes and the first surface such that a first space is formed there between.