The invention relates to a power-assisted dismantling fire-fighting bomb. The power-assisted dismantling fire-fighting bomb comprises a bomb body and a bomb head, the bomb body is filled with a fire extinguishing agent, and a power-assisted dismantling device is fixed to the tail portion of the bomb body; the power-assisted dismantling device comprises a fixed block, a connecting rod and a sliding block, wherein the fixed block is fixed to the tail portion of the bomb body, the connecting rod is fixed to the fixed block, the sliding block is arranged on the connecting rod in a sleeving manner, the fixed block, the connecting rod, the sliding block and the bomb body are coaxially arranged, and a percussion device is fixed to the tail end of the connecting rod and filled with gunpowder; a fuse is arranged at the end of the bomb head, and the fuse is connected with an explosive package arranged in the bomb body through a blasting fuse. According to the fire-fighting bomb, when the fire-fighting bomb is sent, in the flying process, due to the action of air resistance, the sliding block is located on one side of the percussion device, when the fire-fighting bomb is blocked by an obstacle and cannot move forwards continuously, the sliding block can rapidly slide towards one side of the fixed block and impact the fixed block due to inertia, and assisting power is formed to help the fire-fighting bomb to penetrate through the obstacle to enter a fire site.