The invention discloses a light rail output bevel wheel machining process which comprises blank making, normalizing, semifinishing, quenching, finish machining and final inspection. The finish machining process comprises a semi-finish turning I, a semi-finish turning II, a finish turning I, a finish turning II, a grinding gear excircle and a grinding gear. By means of the light rail output bevel wheel machining process, semifinishing and finish machining are carried out twice on an end face after quenching treatment is carried out on a teeth blank, when the teeth blank is clamped on a lathe, alignment is carried out according to pitch circle runout, grinding of the end face is replaced by turning, quality of machined gears is improved, and requirements for light rail high power output are met.