The invention discloses a novel power grid distribution network fault processing device, which, in the structure, comprises a casing, a detection box, an observation window, a first connecting device,a second connecting device, a wire, a fuse, a drawer, a grip and a sliding rail. The left side and the right side of the detection box are provided with the first connecting device and the second connecting device respectively, when a power distribution network line needs to be fixed, the power distribution network line only needs to pass through a fixing hole in a connecting plate, a fixing cover is then squeezed inwardly to enable the power distribution network line to be bent, a knob rotates to fix the fixing cover on a protection cover, fixing on the power distribution network line can thus be completed, and the beneficial effect of quickly fixing the power distribution network line without using a tool can be achieved.