The invention, which belongs to the technical field of power grid detection, provides a remote electric leakage fault alarming device for a transformer substation. With the device, a problem of low detection accuracy of the manual circuit leakage fault detection way can be solved. A main power transmission line is connected outside a transformer substation; and a voltage sensor and an electric leakage protection device are arranged on the main power transmission line. An expansion and contraction unit is arranged on the inner wall of the transformer substation; a camera device is arranged at one end of the expansion and contraction unit; and a single-chip microcomputer is arranged on an inner wall of the other side of the transformer substation. The voltage sensor, the electric leakage protection device, and a coil are connected with the single-chip microcomputer electrically. Besides, a first fixed seat is arranged at the bottom of the transformer substation; an iron core is fixed on the first fixed seat; and a coil winds around the outer side of the iron core. A second fixed seat is arranged on the inner wall of the transformer substation; a connecting rod is connected to the second fixed seat in a rotating mode; and an iron block is arranged at one end of the connecting rod, wherein the iron block and the iron core are arranged on the same horizontal line. A contact block is arranged at the other end of the connecting rod; and an alarm switch corresponding to the contact block is arranged on the inner wall of the transformer substation. With the device, a location of an electric leakage fault can be determined accurately.