The invention provides a multistage weight reduction releasing device applied to intelligent forest fire extinguishment aerial bombs. The multistage weight reduction releasing device comprises an aerial bomb frame, aerial bomb assemblies and control units, wherein the aerial bomb assemblies and the control units are placed in the aerial bomb frame; mounting plates are arranged at the upper ends of the aerial bomb frame; the control units comprise electromagnet assemblies and lever weight reduction mechanisms; the electromagnet assemblies comprise connecting blocks mounted on the mounting plates, direct current electromagnets mounted on the connecting blocks, and expansion rods fixedly connected with inner cores of the direct current electromagnets; the lever weight reduction mechanisms comprise first brackets, second brackets and third brackets that are mounted on the mounting plates; first cross beams are mounted on the first brackets in a hinged manner; second cross beams are mounted on the second brackets in a hinged manner; third cross beams are mounted on the third brackets in a hinged manner; the first cross beams are vertically lapped on the second cross beams; the second cross beams are vertically lapped on the third cross beams; the third cross beams are vertically lapped on the expansion rods; and the aerial bomb assemblies are hung on the first cross beams through lifting ropes. The multistage weight reduction releasing device is simple in structure, and can realize the effects of quick, high-efficiency and safe releasing of the aerial bombs.