The invention discloses an intelligent environment monitoring system which comprises an information collecting unit, a PM 2.5 detecting unit, a central processor, a controller, an air purification unit and a back-end server. The information collecting unit comprises a temperature and humidity sensor, an air pressure sensor and an air speed sensor; the PM 2.5 detecting unit is used for detecting concentration data of indoor and outdoor particle matters, with the particle diameter being smaller than 2.5 [mu]m, of a fortified area; and the central processor is used for receiving electrical signals converted by all numerical values detected by the information collecting unit, and all the numerical values are compared with the threshold values of the temperature, the relative humidity, the absolute pressure intensity, the air speed, the air volume, the PM 2.5 concentration. According to the monitoring system, indoor and outdoor environment-related parameters and the PM 2.5 concentration are monitored in real time, starting and stopping of an air purification device and a temperature and humidity regulation device are automatically controlled, the indoor air quality and environmental comfort level are maintained, and the time and cost for artificial regulation and control are saved.