The invention relates to a multifunctional solid, liquid or dust separator, which comprises a frame, wherein a whirl flow filter screen synchronous filtering concentration continuous deslagging systemis arranged on the frame, which comprises a enclosed whirl flow cylinder, a filter cylinder is coaxially arranged in the inner cavity of the whirl flow cylinder, a cavity is arranged between the whirl flow cylinder and the filter cylinder, the feeding mechanism feeds the raw materials to be separated into the cavity; the filter cylinder is fixed on a hollow shaft and is driven by the hollow shaftto rotate in the whirl flow cylinder, the filter cylinder filters the raw sewage or dust to be separated in the whirl flow cylinder, the upper end of the filter cylinder is provided with a slurry blade for driving the raw sewage or dust to be separated in the inner cavity of the whirl flow cylinder to rotate at a high speed. The multifunctional solid, liquid or dust separator also comprises a rawsewage or dust scouring continuous deslagging system and a negative pressure suction continuous deslagging system which are used for continuously filtering, efficiently concentrating the filtered residues and automatically deslagging with no additional consumption of the filter water or clean air for backflushing and deslagging so as to achieve the aim of highly-efficient and energy-saving filtration of the sewage or dust, and is suitable for industries such as highly-polluting sewage treatment plants, cement plants and the like.