Multi-stage machining device for precision parts

A plurality of guide pins are arranged on a lower base plate and located on the two sides of a material belt respectively, the lower ends of the guide pins are embedded into the lower base plate, and the upper ends of the guide pins extend upwards from the upper surface of the lower base plate and are provided with grooves allowing the edges of the material belt to be embedded. The multiple sets of male dies and female dies which are matched with each other are used for forming a preformed part with the contour the same as that of a part, the edge of the preformed part slightly protrudes out of the edge of the part, and at least two scraping cutters are arranged in front of the male die or the female die located at the forefront and located in the advancing direction of a material belt at intervals. The scraping cutters are installed on the upper base plate or the lower base plate, and the cutter edge contours of the at least two scraping cutters are gradually reduced inwards in the advancing direction of the