The present invention relates to an automatic fire signal device, in particular to a device which can switch on fire signals by analyzing monitored fire factors (smoke density, temperature, etc.). Thedevice of the present invention allows the reduction of the cost of the signal transmission process and ensures the compatibility between an alarm provided with a cheap receiving-monitoring meter andthe analog loop of the signal device. The present invention is characterized in that the processing of information is directly realized in the alarm, and by means of simple analog signals, complex information digital processing results are delivered to the receiving-monitoring meter.