A mounting device for a display module includes a positioning member and an installation member. The positioning member includes a limiting portion and a positioning piece. The limiting portion defines a first receiving slot. The positioning piece defines a cutout. The installation member is secured to the positioning member and includes an elastically deformable limiting block. The installation member defines a second receiving slot and a limiting slot. A limiting rib is located on the limiting block and in the limiting slot. The first receiving slot and the second receiving slot rotatably receive a rotating shaft of the display module therebetween. The limiting block abuts a connecting shaft connected to the rotating shaft and blocks the connecting shaft in the limiting slot. The cutout is adapted to receive the connecting shaft when the rotating shaft is rotated to rotate the connecting shaft out of the limiting slot.