The invention discloses an indoor environment control device which comprises a fresh air chamber, an air return chamber, an air supply chamber, an air exhaust chamber, a total heat exchanger, a compressor, a controller, an air quality monitor and a temperature and humidity sensor. The fresh air chamber is provided with a fresh air port; a valve is arranged on the fresh air port; a variable frequency ultrasonic nebulizer, a first evaporator/condenser and an air supply device are arranged in the air supply chamber; the air return chamber is provided with an air return port; a second evaporator/condenser and an air exhaust fan are arranged in the air exhaust chamber; and the compressor, the first evaporator/condenser and the second condenser/evaporator are connected through a refrigerant pipeso as to form a refrigerating/heating circuit. According to the indoor environment control device provided by the invention, the total heat exchanger and a ventilation structure are utilized for effectively recovering indoor air energy, so that the energy utilization efficiency of a fresh air treatment process is improved; and through heat pump principle and environment multi-parameter monitoring, the full-year high-efficient operation and the integrated control of indoor temperature-humidity and air quality of the device are realized.