Novel suction filtration device

The utility model discloses a novel suction filtration device which comprises a suction filtration box, a filter layer plate capable of being drawn out from the front side is arranged in the suction filtration box, the cross section of the filter layer plate is in a stair step shape which is lowered layer by layer from left to right, a liquid inlet is formed in the top of the left side in the suction filtration box, a liquid outlet is formed in one side of the bottom of the suction filtration box, and a scraping plate is arranged in the suction filtration box through a movable driving piece. The bottom of the scraping plate is in contact with the filtering layer plate; the filtering layer plate is arranged to be in a stair step shape, so that firstly, the surface area of the filtering layer plate can be greatly increased, and the filtering efficiency is improved; 2, in the process that the mother liquor raw material flows from left to right from the filter laminates layer by layer, powder precipitated on the