The invention provides a detachable suspension type crane system for a wind generating set. The crane system comprises a routine maintenance system and a temporary maintenance system; the routine maintenance system comprises routine track supporting components, a routine track and an electric hoist; and the temporary maintenance system comprises temporary track supporting components, temporary tracks and a traveling trolley. During routine maintenance, the routine track is fixed to the routine track supporting components, and the temporary maintenance system is stored in a wind field warehouseon the ground; during maintenance of parts which are relatively far away from a lifting hole and are relatively heavy, various components of the temporary maintenance system are lifted by the electric hoist on the routine track into a cabin via the lifting hole, the temporary tracks are mounted on the temporary track supporting components, the routine track is detached and separated from the routine track supporting components and is fixed to the traveling trolley, and then the parts which are relatively far away from the lifting hole and are relatively heavy can be lifted out of the cabin via the lifting hole for maintenance. By the aid of the crane system, the set cost can be reduced while the space inside the cabin is not occupied.