The utility model discloses a numerical control slot machine, include the slot cutter and connect in one because the left and right blade holder at the bottom both ends of servo electricity telescoping device still includes an adjustable work piece self feeding system that this system includes a base, a vertical left side, the right connecting rod of being connected with respectively in base both sides, left side connecting rod right -hand member, right connecting rod left end are connected with left and right extension rod respectively, and the both sides and the left and right extension rod bottom surface of base upper end are equipped with two spouts respectively, and two have connect rotation, telescoping device on the spout, all are connected with the single -revolution connection pad on rotation, the telescoping device, and the base side is equipped with PLC control system, the utility model discloses a cooperation of four work pieces gyration feeding device of ability automatically regulated position and the cutter that can stretch out and draw back from top to bottom makes the utility model discloses can four keyways of simultaneous processing to can move the part certainly after having processed, reach the purpose that lasts incessant processing, improve the efficiency of work piece processing greatly and lightened workman intensity of labour.