The present invention discloses a fire intelligent automatic alarm system based on wireless communication, the method comprises following steps: step 1, arranging at least one fire fighting device anda fire detecting device and an alarm system at fire prevention sites; and step 2, if the fire detecting device detects fire, firstly starting the fire fighting device and the alarm system, and transmitting the fire situation through a wireless communication transmission module to a fire control unit, which controls a fire accident broadcast system and a fire linkage alarm device; in step 3, continuing to detect the fire and transmitting the fire situation to the fire control unit in real time by the fire detection device and changing fire fighting strategies and alarm strategies through the fire fighting device according to the change of the fire situation. The method can timely detect the fire, notify the fire situation, evacuate personnel, and eliminate the fire in bud state through theautomatic fire fighting device, thereby minimizing the fire hazard.