Abstract: When the mine explosion proof lamp radiator is drilled and tapped by ordinary drilling machine, the traditional fixture can not locate accurately and clamp effectively. According to the structural material and process requirements of the workpiece, a special fixture is designed and manufactured, which can clamp five workpieces on CNC machine at the same time and complete the drilling, chamfering and tapping process under one clamping. The designed fixture completely solves the workpiece positioning and clamping problems caused by soft material and repeated clamping. Through the quality inspection of the workpiece, it is proves that the designed fixture is safe and reliable in operation, convenient and efficient in installation, and has small positioning error and short processing auxiliary time, which effectively guarantees the machining accuracy of the workpiece and improves the production efficiency.