A display module and a display device are described. The display module includes a back plate; a light guide plate disposed on a side of the back plate; a frame including a first base part and a first bulge extending inward, where the first bulge has a first bottom surface, a first end surface, and a second bottom surface jointed in sequence, an end part of the light guide plate is received in a first accommodating cavity and has a first spacing relative to the first bottom surface; an optical film layer disposed on the side of the light guide plate facing away from the back plate, and an end part thereof is located in a second accommodating cavity and has a second spacing relative to the second bottom surface; the first spacing is smaller than the second spacing.