Telephone auto alarm for fire alarm system

The utility model provides a telephone automatic alarm for fire-alarm system belonging to alarm technology region between fire alarm and public telephone network. The utility model comprises a microprocessor, a memory, a serial line interface circuit, a universal asynchronous receiver transmitter, a dual-tone multi-frequency receiver transmitter, a voice operation demonstrator circuit, a telephone interface circuit and a signal processing amplifier. The utility model communicates with the serial line interface circuit and the fire alarm, receives and stores a plurality of telephone numbers and text of alarm information set by the fire alarm. The preset number is dialed when fire alarm occurs, text is converted to voice, the alarm voice is played for the called part, and then the dialed number is transferred back to the fire alarm thereby alarming automatically. Moreover, whether the alarm voice is played via the listening speaker can be chosen during telephone alarm.