The present invention provides a fire detection system, which comprises: at least one fire detector detecting the fire occurrence, receiving power from a fire receiver to operate to detect the fire occurrence, and transmitting the detection of the fire occurrence to the fire receiver; at least one detection IoT device detecting odor in the air to transmit corresponding odor information through a communication network; an external device for monitoring whether the fire has occurred through comparison between the odor information from the detection IoT device and previously stored fire determination data; and a fire transmitter receiving the corresponding information through communication with the fire receiver or the external device in accordance with the detection of the fire occurrence through the fire detector or the detection IoT device to generate an alarm.
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