The invention discloses a protecting device for a storage battery. The protecting device comprises the storage battery, wherein a protective device is arranged on the surface of the storage battery; the protective device comprises a shell; a separation plate is arranged in the shell; the shell is divided into a first chamber and a second chamber through the separation plate; a through hole is formed on the separation plate; the first chamber and the second chamber are communicated with each other through the through hole; a control piston is arranged in the first chamber; the top of the control piston is fixedly connected with the bottom of a thread pillar; the top of the thread pillar penetrates through the shell, extends to the exterior of the shell and is fixedly connected with a handle; a pushing piston is arranged in the second chamber. According to the protecting device for the storage battery, the charging storage battery is protected by the protective device, the safe distance of the storage battery is increased, the children cannot touch the storage battery under charging state, the potential safety hazard is avoided and more convenience is brought to the life of people.