Oily sewage suspended sludge filtration and purification device and sewage treatment process thereof

The embodiment of the invention relates to an oily sewage suspended sludge filtration and purification device and a sewage treatment process thereof, and relates to the technical field of sewage treatment, and the main purposes thereof are to realize the treatment of oily sewage by a reasonable combination of multiple treatment technologies by a single set of equipment and to achieve the goals ofimproving water treatment efficiency, reducing capital investment and reducing operating costs. The device comprises: a filtration and purification tank body with a swirling flocculation zone, a sludge sedimentation zone, a suspension filtration zone and an oil-water separation zone arranged successively from bottom to top; a swirling water inlet component is located in the swirling flocculation zone; a sludge collection component is located at the middle part of the sludge sedimentation zone; an oil absorption component is located at a first height position of the oil-water separation zone; afirst purification row as