The invention relates to an environment parameter perceiving fire hazard judgment method which includes the steps of (1) building three layers of feedforward BP neural networks and invariable T-S-type fuzzy inference systems, (2) collecting infrared rays, smoke, temperature, humidity and light intensity data in a monitored site through a sensor, (3) calculating infrared values in natural light through a light intensity sensor, conducting background infrared removal processing, caused by the natural light, on the infrared values, obtaining the processed infrared values, (4) inputting smoke read values and the infrared values processed by the step (3) into the three layers of trained feedforward BP neural networks, outputting the fire hazard occurrence degree, (5) inputting temperature and humidity read values into the invariable T-S-type fuzzy inference systems, outputting a fire hazard judgment threshold value, (6) comparing the fire hazard occurrence degree with the fire hazard judgment threshold value, and determining that a fire hazard occurs when the fire hazard occurrence degree is larger than the fire hazard judgment threshold value. The environment parameter perceiving fire hazard judgment method has the environment parameter perceiving function and is good in adaptability.