The utility model provides an electrical equipment subassembly cabinet atmospheric control system based on accurate air supply, convulsions wind channel in locating electrical equipment subassembly cabinet, air conditioner air supply channel, a controller, it is regional to be equipped with at least one target control in the electrical equipment subassembly cabinet, install electrical equipment inthe target control region, the regional correspondence of target control is equipped with air supply channel, the air intake of air conditioner and the air intake in convulsions wind channel intercommunication, air supply channel's air outlet department is located in the target control region, convulsions wind channel and target control region connected, be equipped with a heater and a temperature and humidity sensor in the air supply channel, be equipped with the 2nd temperature and humidity sensor in the target control region, first and second temperature and humidity sensor's signal outputpart is connected with the signal reception of controller end, control signal output and the air conditioner and the heater connection of controller. The utility model discloses it is regional directly to deliver to the target control that has electrical equipment in the cabinet with the air -out air that meets the demands, realizes the accurate control to target control area temperature and humidity.