The invention relates to an energy-saving system device for fresh air, and relates to the field of electrical technology. The energy-saving system device comprises a main control unit module, an air inlet system module, an exhaust system module, a temperature and humidity control module, a key setting module, a status display module, a power module, a power-off protection module, a self-recovery function module and a communication function module. The air inlet system module, the exhaust system module, the temperature and humidity control module, the key setting module, the status display module, the power module, the power-off protection module, the self-recovery function module and the communication function module are respectively connected with the main control unit module. Therefore, the formed energy-saving system device for fresh air with various functions of control, indication and integration is capable of replacing existing air exchange fans, negative-ion generators or air purifiers, household central air conditioners, large-tonnage central air conditioners.