Embodiments of the disclosure provide a backlight module and display device. The backlight module comprises: a light guide plate (1), a PCB substrate (2) disposed at a side of the light guide plate (1); wherein a side of the PCB substrate (2) facing the light guide plate (1) is provided with a plurality of groups of light source devices (3); a side of the light guide plate (1) facing the PCB substrate (2) is provided with a plurality of recesses for accommodating the light source devices; a plurality of projections (111) disposed on an inner surface of the recess (11).