The powerful and extremely robust wet/dry vacuum cleaner are equipped with a world-wide unique, highly efficient, automatic filter cleaning device which allows the pick-up of huge fine dust quantities with constantly high suction performance without interruption of work. The safety vacuum cleaner is equipped with the antistatic system (grounded until suction hose connector) and electrically conductive accessory. Through the grounded connection port electrostatic charge will securely be deduced. The charge of the accessories through friction of dust inside the hose and the therewith combined sparking can thus safely be avoided with an electronically leading suction hose. The whole machine, including accessory, is equipped for dust class M. Also applicable as wet vacuum cleaner for the absorption of liquids.