Machine tool clamping mechanical chuck capable of being switched between manual operation and automatic operation

The invention discloses a machine tool clamping mechanical chuck capable of being switched between manual operation and automatic operation. The machine tool clamping mechanical chuck comprises a mechanical chuck mechanism and a manual-operation and automatic-operation switching mechanism. The manual-operation and automatic-operation switching mechanism is arranged at one side of the mechanical chuck mechanism. The manual-operation and automatic-operation switching mechanism comprises a switching mechanism support, a double-head air cylinder, a lifting gear shaft, a long-column-shaped gear, adriving gear and a pneumatic motor. The two ends of the double-head air cylinder are fixed to the switching mechanism support. The lifting gear shaft is fixedly connected with a cylinder body of the double-head air cylinder through a connecting support. The long-column-shaped gear is fixed to one end of the lifting gear shaft. The driving gear is engaged with the long-column-shaped gear, arrangedon the pneumatic motor and