Automatic monitoring system and monitoring method of transformer substation phone system

The invention relates to the technical field of power communication, and particularly relates to an automatic monitoring system and monitoring method of a transformer substation phone system. A recording phone is used as a phone extension of a transformer substation, and an automatic dialing test server is arranged at a phone switchboard, so as to form an automatic monitoring system. The automaticdialing test server can automatically dial phone extension numbers of all transformer substations in sequence, when the phone extension detects that an incoming call is a detected number, the phone extension answers automatically with a specific recording prompt voice, the automatic dialing test server identifies and determines the recording prompt voice, so as to obtain a state of the phone extension line, so that the transformer substation phone system line is monitored automatically. The line fault of the phone system is found rapidly and repaired timely, therefore, the transformer substation phone can be guarante