The invention discloses an electrical equipment decontamination cleaner which comprises a cleaning head driven by a transmission hose through a power device, wherein the cleaning head comprises a rotary brush which is vertically arranged; a protective cover with a C-shaped cross section covers one side of the rotary brush; a handle is fixedly arranged at the outer side of the protective cover; an upper rod which extends transversely is fixedly arranged at the upper end inside the protective cover; the end part of the upper rod is in running fit to the upper end of the rotary brush through an upper connecting device; the lower end inside the protective cover is hinged to a lower rod which can swing up and down through a horizontal shaft; and the lower rod is in running fit to the lower end of the rotary brush through a lower connecting device. The electrical equipment decontamination cleaner has the advantages that the structure is reasonable, a scrubbing task can be quickly completed according to the shape of scrubbed equipment, a short-distance scrubbing mode and a long-distance scrubbing mode can be freely and quickly switched without changing the location of an operator, a scrubbing angle is arbitrarily adjustable, stubborn stains can be scrubbed without a scrubbing dead angle, time and labor are saved, protection on scrubbing staff is good due to the fact that the scrubbing staff does not suck and is not infected with dust, the problem that dirt enters eyes of the scrubbing staff is further avoided, dust dirt obtained by scrubbing does not drops to equipment below, limitation of scrubbing height is avoided, one people can independently complete the scrubbing task, and the scrubbing effect is good.