The invention relates to a middle beam reinforcing and lifting device for steel structure transformation. The middle beam reinforcing and lifting device can effectively solve the problems that in the prior art, a crane cannot enter a construction area, a reinforced object cannot be manually lifted to a specified position, and the safety and the efficiency are low. According to the technical scheme, the middle beam reinforcing and lifting device comprises an original building lifting point setting device and a lifted object lifting point device, the original building lifting point setting device is composed of a first fixing plate, a second fixing plate, a lifting supporting plate, a reinforcing rib plate, a hand-screwing jackscrew and a nut, and the lifted object lifting point device is composed of supporting plates connected with one another. The middle beam reinforcing and lifting device is novel and unique in structure, simple and reasonable, easy to produce, small in lifting difficulty, safe, reliable, simple lifting operation of a transformed object, convenient to mount and demount, capable of greatly shortening the lifting time, capable of reducing the lifting difficulty, capable of saving time and labor, capable of being widely applied to super high-rise reconstruction and lifting of the transformed object in limited space, and innovative for the middle beam reinforcing and lifting device for steel structure reconstruction.