The invention provides a boring device for a differential shell, and relates to the technical field of boring. The boring device for the differential shell comprises a rack, a clamping mechanism is arranged on the upper surface of the rack and used for clamping the differential shell, cutter sliding rails are arranged on the two sides of the rack correspondingly, the cutter sliding rails are arranged in the length direction of the rack, the cutter sliding rails are slidably connected with a cutter base, and the rack is provided with two first drivers; an output shaft of the first drive is connected with one side of the tool base through a
ball screw so as to drive the tool base to slide along the tool sliding rail, a second drive is arranged on the upper surface of the tool base, an output shaft of the second drive is fixedly connected with a boring tool, and displacement sensors are arranged in the tool base. The first drive and the second drive are both electrically connected with the central controller, the displacement sensor is electrically connected with the central controller, and the central controller can judge the moving distance of the two tool bases according to displacement data and conduct dynamic compensation so as to ensure that the displacement of the two tool bases can be consistent all the time.