Plug connector and connector assembly

The invention discloses a plug connector and a connector assembly, a fixed ring is clamped on a plug protection shell of the plug connector, a rotating ring and a reset pressure spring are arranged in a space formed by the fixed ring and a locking sleeve, the rotating ring is clamped on the locking sleeve and can synchronously rotate with the locking sleeve, and the reset pressure spring is arranged in the space formed by the fixed ring and the locking sleeve. The rotating ring clamped on the locking sleeve is meshed with the fixed ring, the inclined angles of the helical tooth surfaces of the fixed ring and the rotating ring in the clockwise rotation direction and the anticlockwise rotation direction are different, and when the plug protection shell is locked with the adaptive socket and the locking sleeve is rotated in the clockwise direction, the plug protection shell drives the plug contact element to quickly and axially move. In the unlocking process, the locking sleeve is rotated anticlockwise, the rota