Clamping jaw for preventing workpiece from falling off

The utility model relates to the technical field of mechanical auxiliary equipment for an assembly line, in particular to a clamping jaw for preventing a workpiece from falling off. A clamping jaw for preventing a workpiece from falling off comprises a fixing base and is characterized in that the fixing base is further provided with a left upper clamping arm, a right upper clamping arm, a left gear, a right gear and a motor, the left gear and the right gear are meshed with each other and rotationally supported on the fixing base, and the upper end of the left upper clamping arm and the upper end of the right upper clamping arm deviate from each other and are both pivoted to the fixing base; the lower end of the left upper clamping arm is pivoted with the upper end of the left lower clamping arm, the lower end of the right upper clamping arm is pivoted with the upper end of the right lower clamping arm, the lower end of the left lower clamping arm is pivoted with the lower end of the right lower clamping arm,