Emergency power supply device for electric vehicle

The invention discloses an emergency power supply device for an electric vehicle. The emergency power supply device comprises a motor and an original vehicle storage battery for supplying power to the motor, and the motor is connected with the original vehicle storage battery to form a power supply circuit; the emergency power supply device further comprises an emergency storage battery, emergency sockets and emergency plugs used in cooperation with the emergency sockets, the emergency sockets are connected to the power supply circuit in series, the emergency storage battery is connected to the two ends of the original vehicle storage battery through cooperative utilization of the emergency plugs and the emergency sockets, and when the emergency storage battery supplies power to the motor, power supply of the original storage battery is immediately cut off through a controller. By means of the emergency storage battery connected to the two ends of the original vehicle storage battery and cooperative utilizati