Servo driving mould replacing device

The utility model relates to a servo driving mould replacing device which comprises a servo motor, a ball screw, a small sliding block and a guiding track. The servo motor is connected with the ball screw and drives the ball screw to rotate, a nut matched with the ball screw is fixed on the small sliding block, the small sliding block is connected with the ball screw through the nut, the small sliding block is in sliding connection with the guiding track front and back, a plurality of mould sets are fixed on the small sliding block side by side front and back, each mould set comprises a punch mould base, a punch mould sleeve, a necking mould and a small pushing rod, one mould set is provided with a thickening mould which is embedded into one end, abutting against the corresponding punch mould base, of the corresponding necking mould, the contacting face of the thickening die and the corresponding necking die is in a step shape, a cone hole is formed in the other end of the necking mould, and the cone hole is