This disclosure relates to a display module assembly that includes two optical module assemblies, two first adjustment mechanisms, two image generation devices, and two second adjustment mechanisms each corresponding to one of the first adjustment mechanisms. Each first adjustment mechanism is movably connected to a corresponding one of the optical module assemblies for adjusting distance between the two optical module assemblies. Each image generation device is movably connected to a corresponding one of the optical module assemblies, and project an image to a predetermined direction through its corresponding optical module assembly. Each second adjustment mechanism is movably connected to corresponding one of the image generation devices for adjusting a distance between the image generation device and the optical module assembly. The display module assembly and an electronic device in this disclosure can adjust an interpupillary distance and a diopter so as to adapt for different users.