Plastic steel size setting and size fixing machine

The utility model provides a plastic steel size setting machine which comprises a cutting device and a driving device, the driving device is connected with the cutting device, and the cutting device is driven by the driving device to cut zipper teeth. The cutting device comprises a cutter, a sliding cutter holder and an up-down sliding plate; the cutter is fixedly arranged on one side of the sliding tool apron, a sliding cavity allowing the up-down sliding plate to slide up and down is formed in the sliding tool apron, the up-down sliding plate is provided with a first side face making contact with the inner wall of the sliding tool apron, and the first side face is an inclined face. The driving device drives the up-down sliding plate to slide downwards so as to drive the sliding tool apron to move towards the two sides, and meanwhile the sliding tool apron drives the cutter to push away waste teeth towards the two sides. The zipper tooth cutting device has the advantages that the cutting device can cut zippe