The invention provides an automatic scrap treatment system and method of a numerical control production line. The automatic scrap treatment system of the numerical control production line comprises a scrap conveyor belt, a scrap caking machine, a scrap cake conveyor belt and a scrap cake vehicle. The scrap conveyor belt is installed below a scrap discharge outlet. The tail end of the scrap conveyor belt extends into a hopper. The hopper communicates with a scrap inlet of the scrap caking machine. One end of the scrap cake conveyor belt is located below a cake outlet of the scrap caking machine, and the other end of the scrap cake conveyor belt extends towards the scrap cake vehicle. A pressure sensor is arranged in the position of the inner wall of the bottom of the hopper. The scrap conveyor belt, the scrap caking machine, the scrap cake conveyor belt and the pressure sensor are all electrically connected with a control device and an operation panel. A placing space for a scrap guiding slide vehicle is reserved between the scrap conveyor belt and the hopper. The scrap guiding slide vehicle is formed by connecting a slide, a fixing frame and land wheels. The slide is obliquely arranged and detachably installed on the fixing frame. The automatic scrap treatment system and method of the numerical control production line have the technical effects that scraps discharged by the numerical control production line are automatically treated, the labor intensity of workers is greatly relieved and the equipment energy consumption is reduced.