Abstract: A continuous filtration device comprising a cylindrical filter rotationally driven around the axis thereof, a filtration tank in which an outer chamber having an inlet for a liquid to be cleaned and an inner chamber having an exit for a liquid filtrate are separated by the filter, a cleaning means disposed in the outer chamber for spraying a cleaning liquid at high pressure at an acute angle to a surface of a filter to be cleaned, and a guide plate disposed at a position on the side opposite to the cleaning means with respect to the surface to be cleaned for guiding obstacles removed by cleaning and detaching them from the filter. The filter can be automatically cleaned by spraying a liquid to be filtered, liquid filtrate or similar other liquid to the surface of the contaminated filter. The device is useful, for example, for filtration of marine fuel oils or lubricants.