An airdrop forest fire extinguishing bomb is aerial firefighting equipment that is mainly loaded on an aerial platform such as a helicopter and an unmanned aerial vehicle, employs an airdrop launching mode, flies in an unpowered gliding mode, and implements high-precision forest fire extinguishing by means of guidance control. A three-section split structure is used, and a seeker cabin, an agent cabin, and a steering engine cabin are sequentially arranged from front to back; the seeker cabin is used for providing a mounting space for a head aerodynamic configuration and an infrared seeker; the agent cabin is used for loading a fire extinguishing agent; fins are fixed to the outer surface of the agent cabin; and the steering engine cabin is used for providing a mounting space for a steering engine and an avionics system and providing a control moment when a bomb body flies. The airdrop forest fire extinguishing bomb employs a throwing mode of a central detonation tube structure, and the fire extinguishing agent preloaded in the agent cabin is driven to be throwed to the periphery by means of explosion to form a certain area of coverage, thereby achieving a fire extinguishing effect.