The invention belongs to the technical field of machinery, and relates to an installation device for a fishbone crusher. The installation device solves the problems that an existing fishbone crusher is low in installation efficiency and the like. The fishbone crusher comprises a primary crushing unit and a secondary crushing unit. The installation device comprises a support corresponding to installation holes, a horizontal telescopic rod is arranged at the support in the horizontal direction, and a fixing seat is arranged at the front end of the horizontal telescopic rod; a vertical telescopicrod is arranged at the fixing seat in the vertical direction, the upper end of the vertical telescopic rod can abut against the inner wall of an inner cylinder body, and a material pipe can be arranged on the horizontal telescopic rod in a sleeving mode; and the installation device further comprises a driving mechanism which can drive the material pipe to be clamped with the end part of the innercylinder body. According to the installation device, the installation efficiency of the fishbone crusher can be improved.