Abstract: A better structure of fire-fighting bomb which refers on the moment of producing huge amounts of gases on explosion by the gunpowder room on shooting the bomb, by utilizing the pressure of huge gases to better the operation of said fire-fighting bomb which increases the mutual reaction time of chemical reactants in the internal space of the bomb to complete the reaction and elevate the efficiency of inhibiting combustion substances produced by chemical reactions such as the liquid containing huge amounts of carbon dioxide bubble; wherein when the bomb hits the target, the inhibiting combustion substance produced by the bomb is sprayed out to the target fire source to achieve the purpose of extinction of fire.