The invention discloses a transformer-supplied area power-cut notifying machine. The machine adopts the interruption of mains supply as a detection signal, and a mains supply is connected with a control circuit through the DC power signal of a power-cut detection circuit to allow a dialing unit to remain in stand-by status; at the same time, a DC power charges a battery through a charging circuit, and the charging circuit supplies power to the dialing unit; in case of interruption of mains supply, the DC power signal is absent, and the control circuit adjusts the dialing unit to dialing status; and the battery is used for supplying power to the dialing unit, and the dialing unit dials the number of a preset mobile phone or a preset fixed phone by means of wireless or telephone wire long-distance dialing; therefore, following the power-cut, trip and closedown of the transformer-supplied area, a wired or wireless dialing unit can be instantly used for automatically making a phone call to notify an electrician of the transformer-supplied area and to provide reliable information for the electrician. Moreover, the invention can assist in guarding the circuit of the transformer-suppliedarea against theft. The invention has the advantages of simple and practical structure, convenient use and unattended operation, thereby developing quality service resources, revolutionizing the power supply authority's service means, and improving service level.