Adjusting device, vehicle-mounted display equipment, seat assembly and vehicle

The utility model discloses an adjusting device, a vehicle-mounted display device, a seat assembly and a vehicle, the adjusting device comprises a shell, a driving mechanism, a transmission mechanism and a damping mechanism, the shell is suitable for being installed on the back face of a vehicle seat, the driving mechanism and the damping mechanism are arranged on the shell, the transmission mechanism is movably installed on the shell and is in transmission connection with the driving mechanism, and the damping mechanism is arranged on the shell. The damping mechanism is connected with the transmission mechanism and applies damping force to the transmission mechanism; the transmission mechanism is suitable for being connected with the display screen. The driving mechanism drives the display screen to rotate through the transmission mechanism. According to the adjusting device, the display screen can be rotated to improve the watching experience of a user, meanwhile, the movement stability of the display screen can be guaranteed, and the display screen can rotate more stably.