A notification system of environment abnormality includes a network system, a plurality of sensors, a judgment system, and an abnormality notification system. The sensors are configured to a plurality of individuals, respectively, and capable of collecting position data of the individuals through the network system. The judgment system includes an identification unit and a biological information database containing a plurality of behavior data. The behavior data include at least a normal behavior information and an abnormal behavior information of a creature. The identification unit receives the position data of the individuals from the sensors. The abnormality notification system communicates with the identification unit. The identification unit processes the position data and then compares the position data with the behavior information stored in the biological information database. When the position data match the abnormal behavior information, the identification unit notifies the abnormality notification system to output an environment abnormality notification.