The invention discloses an emergency power supply device for a box-type substation. The emergency power supply device comprises an emergency power supply, a dual power supply changeover switch and a handle assembly. The outgoing end of the dual power supply changeover switch is electrically connected with a low voltage shunt switch. The handle assembly is used for controlling the incoming end of the dual power supply changeover switch to switch on the emergency power supply or the transformer, When the emergency power supply is needed for power supply, the incoming end of the dual power supplychangeover switch is enabled to be connected with the emergency power supply by the handle assembly so that the emergency power supply can be quickly realized and the power failure time on the user side can be greatly shortened.