According to the complexity of the straight profile circular plane worm gear pair’s space tooth surface, the virtual machining modeling of the straight profile worm gearing was completed by using the secondary development platform UG/Open, which was provided by UG. Through ADAMS simulation analysis, the results show that the worm speed is constant, and the relative error of worm wheel speed is only 0.26% compared with the theoretical value, which verifies the correctness of the straight surface enveloping worm gearing model.