Stretching mechanism and net pulling machine

The utility model discloses a stretching mechanism and a net pulling machine, and belongs to the technical field of net pulling machines, the stretching mechanism comprises a plurality of locking pieces used for locking a silk screen, and the stretching mechanism further comprises a fixing mechanism and a driving mechanism. And the mounting piece is used for mounting the locking piece and placing and fixing the silk screen. The stretching part is arranged in the mounting part and used for adjusting the mounting part to be matched with the locking part to stretch the silk screen, the locking part is matched with the mounting part to lock the silk screen, and the stretching part drives the mounting part and the locking part to stretch and tighten the locked silk screen. The tightening degree is adjusted by rotating the handle, so that the tightening force can be sensed according to the force of rotating the handle; and when a small silk screen is encountered, the distance between the two locking pieces is adjus