The invention discloses a power distribution network overvoltage sensing device. A galvanized steel bracket is vertically mounted on a cross arm of a power transmission pole. One end of the galvanizedsteel bracket extends to outside of the cross arm of the power transmission pole. The part which extends out of the cross arm of the power transmission pole is used for mounting an acquisition type insulator. The mounting position of an energy acquisition type insulator is between two cross arms of the power transmission pole. The intersection part between the galvanized steel bracket and the cross arm of the pole is bound and fixed by a stainless steel cable. The upper end of the energy acquisition type insulator is fixedly connected with a wire clamp for the power distribution line througha bolt leading-out wire. The upper end of the acquisition type insulator is connected with the upper end of the energy acquisition type insulator through a lead. An overvoltage measuring device is fixed below the cross arm of the power transmission pile through a holding hoop. The overvoltage measuring device is connected with two insulator output ends by means of an aviation plug. According to the power distribution network overvoltage sensing device, through an installing solution of reasonably designing the energy acquisition type insulator, the acquisition type insulator, the overvoltage measuring device and the like, large-scale application of the overvoltage sensing device is realized, and lightning overvoltage in the power distribution network is effectively sensed.