The invention discloses a fire extinguishment water bomb capable of pulling out a plug in a spring manner. Fire extinguishment can be achieved in a throwing manner, umbrella-shaped water can be sprayed within a certain range around the fire extinguishment water bomb for fire extinguishment after the fire extinguishment water bomb is thrown, and the danger of fire extinguishment personnel is relieved. The fire extinguishment water bomb is composed of a water storage cavity, a spring, a piston, a spring wheel and gears. The water bomb is spherical. A center core is a hollow cylinder, and the water storage cavity is formed in the upper portion of the hollow cylinder. Water spray holes are formed in an upper body of the water bomb and communicate with the interior of the water storage cavity through water spray channels. The plug is inserted in a plug hole in the tail of a pull rod below the piston. The plug penetrates a plug clamp hole, one end of the plug is screwed in a hollow shaft, and the large gears are mounted on the hollow shaft. A labor-saving transmission gear set is formed by combining the large gears and the small gears on the gear shaft between the interior of a spherical body of the water bomb and the spring wheel. A winding handle is arranged at the end, outside the spherical body, of the spring shaft and hidden in a handle pit. A handle stop pin which can be taken down to stop rotation of the winding handle is arranged on the handle pit, and a water filling opening is formed in the top of the spherical body of the water bomb.