Rail transit underground station comprehensive energy-saving ventilation air-conditioning system

The utility model discloses a comprehensive energy-saving type ventilation air-conditioning system of a rail transit underground station. The comprehensive energy-saving type ventilation air-conditioning system comprises a public area ventilation air-conditioning and smoke exhaust system, an equipment management room ventilation system, an equipment management room water-cooling multi-connection split air-conditioning system, a public area air-conditioning chilled water system and a public area and equipment management room shared cooling water system. The energy-saving method comprises the following steps: in an air-conditioning season, a fresh air fan in a public area only operates when CO2 exceeds the standard, and a room supply and exhaust fan for equipment only intermittently operates when the temperature is low at night; according to the non-air-conditioning season combined air conditioning unit, a fresh air machine in a public area does not operate, and a room supply and exhaust fan for equipment opera