Bidirectional emergency power supply system and use method thereof

The invention relates to a bidirectional emergency power supply system and a use method thereof, and the system comprises a power supply dust detection module, an emergency power supply high-low voltage line, an air door driving module and a wind shield driving module which are arranged in a bidirectional emergency power supply accommodation space, and a bidirectional emergency power supply low-voltage control module is arranged on an emergency power supply low-voltage power supply line. The low-voltage control module sequences the received voltage and electric quantity of the emergency battery pack of each landing every 24 hours, and then communicates the battery pack of the landing with the highest voltage and electric quantity with a line output by the low-voltage control module; therefore, 24-hour power supply is carried out on ventilation doors and wind shields used for ventilation and heat dissipation and dust detection modules of all landing stations of the bidirectional emergency power supply system t