After machining on the vertical milling machine, the shaft is as shown in Figure 1. Because the two flats are not at the end, they can only be clamped on the indexing head with an end mill. For each milling, the head needs to be shaken once. High-volume milling with a monthly output of 10,000 pieces, high labor intensity and low production efficiency. To this end, we have made high-efficiency milling and flattening fixtures for horizontal milling machines, each time clamping 10 pieces, with the advantages of simple structure, reliable clamping, convenient chip output, and improved work efficiency.