A display screen deflection mechanism, a display screen assembly, and a vehicle are provided. The display screen deflection mechanism includes a mounting base and a push component. The mounting base is used for mounting a display screen, and the mounting base has a first side and a second side opposite to each other in a first direction. The push component includes a driving apparatus and a coupling structure, and through the coupling structure, the driving apparatus drives the mounting base to move relative to the driving apparatus while deflecting toward the first side, or to move relative to the driving apparatus while deflecting movement toward the second side.