The composite cleaning apparatus cleaning device for the electric dust collector for removing dust trapped in the dust collecting electrode in the electric dust collector by using the washing water or air at the time of driving air of the electric dust collector for cleaning the present invention, the electric dust collector made parts drain formed on the upper side and the left / right side frame and the lower that of said inner surface of each frame is coupled to a closure or housing and the left / right frame with the opening and closing door to be opened for movement combined injection portion compound injection is coupled to the vertical drive unit and the vertical driving unit to move in parts of the vertical movement up and down, and the air injection nozzle is a plurality formed in the air tube and the washing water spray nozzle is fed a compound ejecting portion to the air and the washing water consisting of a plurality formed in the cleaning water tube supply unit and the technical features of a drive control unit for controlling the overall operation of the configuration in which As there are effective to install a cleaning device capable of both the wet scrubbing and dry scrubbing in a relatively small space, compared to a conventional dry cleaning apparatus, and a wet cleaning apparatus through the dry cleaning or wet cleaning affect the operation of the electric dust collector and it is in a effective, without short effective to clean the electric dust collector, and can this way at all times maintain the dust collection efficiency of the electric precipitator by allowing the dust collection performance of the electric dust collector with the same effect can be exerted fully effective, during the initial stage of the electric dust collector it is effective to prevent such a re-scattering of already collected dust.