Spiral bevel gear milling machine is a typical representative of complex manufacturing equipments with complex structure and machining mechanism. It is important to improve the manufacturing capacity of spiral bevel gear milling machine in China. The motion parameters’ design procedures of every axis of the monolithic structure spiral bevel gear milling machine are derived by analyzing the machining mechanism of the spiral bevel gear and the relationships between the structure and motion of the PHOENIX?II spiral bevel gear milling machine. The virtual machining model of the monolithic structure spiral bevel gear milling machine is built using three-dimensional machining simulation software VERICUT, and the virtual machining on one pair of given spiral bevel gears is also carried out. The simulation results indicate that there are no design flaws such as interference and so on among the cutter head and the moving parts of the spiral bevel gear milling machine, and the functional verification requirement of spiral bevel gear milling machine can be satisfied. The virtual machining method can provide reference for designing the spiral bevel gear milling machine.