The invention provides a split washer mounting device with a detection function. The mounting device comprises a bottom plate, a supporting seat, a rotating shaft, a clamping spring groove, a side plate, a go and no-go gauge, a first guide rail, a first slide block, a clamping block, a first air cylinder connector, a first air cylinder fixing plate, a first air cylinder, a hole clamping plate, a shaft clamping plate, a pressing head, a second air cylinder, a second air cylinder fixing plate, a second air cylinder connector, a second sliding block, a second guide rail, a pushing block, a feeding barrel, a cushion block, a third air cylinder fixing plate, a third air cylinder connector, a third air cylinder, a limiting groove and a split washer. According to the split washer mounting devicewith the detection function, the split washer can be automatically assembled by means of the pushing block and other structures, the requirement for skills of operators is low, and the problem that the split washer is low in installation efficiency is solved; and in addition, the function of automatically detecting the bottom diameter of the clamping spring groove and the groove width of the clamping spring groove is further added, so that the phenomenon that the split washer falls off due to the facts that the bottom diameter of a clamping spring groove is large and the groove width of the clamping spring groove is small is effectively prevented and avoided.