Efficient smoke exhaust system for public area of subway station and smoke exhaust method of efficient smoke exhaust system

The invention discloses a subway station public area efficient smoke exhaust system which comprises a station hall layer and a platform layer, a first public area smoke prevention partition and a second public area smoke prevention partition are arranged in the station hall layer, and a third public area smoke prevention partition is arranged on the platform layer; the connection mode of the second public area smoke-proof subarea and the third public area smoke-proof subarea is the same as the connection mode of the first public area smoke-proof subarea and the third public area smoke-proof subarea. The interlocking control of the subway station combined air conditioner, the smoke exhaust fan and the back exhaust fan is realized through a BAS system and an intelligent low-voltage system; according to the smoke exhaust method of the efficient smoke exhaust system for the public area of the subway station, an air pipe and a double-layer shutter air supply outlet at the tail end of the station air supply system