Disclosed are a filtration device and a filtration method. The filtration device comprises a casing (1), a filtration cylinder (2) and a drive component (3), wherein the filtration cylinder (2) comprises a cylinder body (21) in the shape of a hollow rotating body, and a side wall of the cylinder body (21) forms a filtration part (22) used for filtering a fluid and the cylinder body (21) is mounted in the casing (1) and can rotate relative to the casing (1), and the drive component (3) is used to drive the cylinder body (21) to rotate. The filtration device also comprises a sprayer (4) which is located in a cavity of the cylinder body (21) with a liquid spraying direction facing towards a side wall of the cylinder body (21), a liquid inlet pipe (5) connected to the sprayer (4), a dirt scraping member (6) which is located in the cavity of the cylinder body (21) and is used to scrape dirt and a small amount of fluid adhered to the filtration part (22) off the filtration part (22) when the cylinder body (21) is rotating, and a dirt accommodation container (7), wherein the dirt accommodation container (7) is provided with a dirt accommodation groove, and at least a part of the dirt accommodation groove is located in the cavity of the cylinder body (21) and is used to receive the dirt scraped off. The filtration device and the filtration method can constantly clean the dirt adhered to the cylinder body (21) during the filtration of the fluid, so that there is no need of manual cleaning for the dirt and the working efficiency thereof can be improved.Linvention concerne un dispositif de filtration et un procédé de filtration. Le dispositif de filtration comprend un boîtier (1), un cylindre de filtration (2) et un élément dentraînement (3), le cylindre de filtration (2) comprenant un corps de cylindre (21) sous la forme dun corps rotatif creux, et une paroi latérale du corps de cylindre (21) forme une partie de filtration (22) utilisée pour filtrer un fluide et le corps de
