Safety type standby emergency power supply device

A safe standby emergency power supply device provided by the present invention comprises a protection shell and an emergency power supply body, a protection cavity is formed in the protection shell, the protection cavity is communicated with the outer wall of the protection shell through an air inlet, a dustproof heat dissipation net is embedded in the side wall of the protection cavity, a heat dissipation mechanism is arranged on the protection shell, and a fire extinguishing mechanism is arranged on the heat dissipation mechanism. The emergency power supply body is connected to the bottom wall of the protection cavity. Heat dissipated by the emergency power supply body in the protection shell can be effectively discharged, when an internal fire occurs, a fire alarm can be automatically sensed through the heat transfer capacity of the L-shaped heat conduction strips, and when the fire alarm occurs, cooling water is automatically controlled to be atomized and then sprayed out at multiple angles to extinguish