Vehicle frame assembly mechanism capable of automatically screwing screws

The invention discloses a vehicle frame assembly mechanism capable of automatically tightening screws, and belongs to the field of mechanical equipment for vehicle frame assembly and machining. According to the vehicle frame assembly mechanism capable of automatically tightening the screws, a screw conveying belt is horizontally arranged on a screw guide rotary roll in a winding manner; a screw horizontal pushing mechanism and a screw transferring mechanism are sequentially and fixedly arranged on a screw conveying support at one side of the screw conveying belt in the horizontal direction; ascrew tightening mechanism is vertically arranged on the screw conveying support at one side of the upper end of a vehicle frame conveying through hole; a screw pushing rotary plate is horizontally arranged at the lower side of a rotary electromagnet; a screw guide rail is horizontally and fixedly arranged at the upper side of a guide rail connection plate; an adjustment guide plate is slidably arranged on an adjustment g