The invention discloses a cover sealing device for a storage battery. The device comprises a support column, a conveyor belt, a clamping block, the storage battery, a motor, a fixing plate, a discharging frame, a rubber buffer plate, a rubber roller, a fixing frame, a placing plate, a storage battery top cover, a top plate, a fixing shaft, a sliding block, a first linear actuator, a second linearactuator, a connecting plate, an air pump, an air suction pipe, a vacuum sucker, an exhaust pipe, a solenoid valve and a solenoid valve controller. The cover sealing device for the storage battery issimple in structure and novel in design, automatic cover sealing of the storage battery is achieved, the storage battery cover sealing efficiency is improved, the labor intensity of workers is lowered, the time is shortened, cover sealing can be conveniently conducted on the storage battery continuously, the cover sealing efficiency of the storage battery is improved, and the workers can use the device conveniently; when the device is used, by means of interaction of the air pump, the air suction pipe, the exhaust pipe, the vacuum sucker and the connecting plate, stable fixing of the storage battery top cover is achieved, it is guaranteed that the storage battery is stable in the adjusting process, and use is facilitated.