The utility model relates to a telegraphone field, concretely relates to telegraphone monitoring alarm device, the problem of the technique is solved for: the utility model provides a can carry out real -time supervision, the telegraphone monitoring alarm device that can report to the police when the telegraphone appearance is unusual to the telegraphone, the technical scheme who adopts does: a telegraphone monitoring alarm device, includes phone circuit signal port, rectifier circuit, power supply circuit, control circuit and warning circuit, phone circuit signal port links to each other with rectifier circuit's input, rectifier circuit's output links to each other with control circuit's input, control circuit's output links to each other with warning circuit, power supply circuit links to each other with warning circuit, be applicable to the phone field.