The utility model discloses a differential synchronizer for a shaft cage, belonging to the technical field of construction. The differential synchronizer for the shaft cage comprises a movable pulley block and a balancing weight, and further comprises a track, an upper position limiter, a lower position limiter, a secondary rope hoisting machine, emergency stop switches, an upper beam and a lower beam; the upper beam and the lower beam are arranged on the right side of a portal frame and are positioned between an upright post and an inclined support; the track is arranged between the upper beam and the lower beam; the balancing weight is arranged on the track; the upper position limiter, the lower position limiter are arranged on the upright post; and a secondary rope passes through a left fixed pulley, the movable pulley block and a right fixed pulley to the secondary rope hoisting machine. According to the differential synchronizer disclosed by the utility model, the risk that the cage falls is reduced, meanwhile the safety risk of workers is reduced and the working efficiency is improved; the problem of different speeds of a primary rope and the secondary rope is solved; and construction materials can be safely and fast transported in a shaft from top to bottom.