Turnover device for vehicle-mounted display screen and vehicle-mounted display screen system

The utility model provides a turnover device for a vehicle-mounted display screen and a vehicle-mounted display screen system. The turnover device is suitable for driving the vehicle-mounted display screen to turn over around a rotating shaft and comprises a display screen support and a driving device, wherein the display screen support is provided with a first mounting part suitable for being attached to the vehicle-mounted display screen and a second mounting part parallel to the rotating shaft; the driving assembly is attached to the second mounting part and is provided with a driving shaft parallel to the rotating shaft; the driving assembly is configured to comprise a first driving section moving along the driving shaft and a second driving section rotating around the driving shaft, the first driving section is coupled to the second driving section to transmit driving force, and at least the first driving section provides a self-locking function. According to the turnover device, a self-locking function