Rotary disc filter for sewage treatment

The utility model discloses a rotary disc filter for sewage treatment, which comprises a device body, a rotating rod is movably mounted in the device body, a fixed disc is fixedly mounted at the top of the rotating rod, a mounting ring is movably mounted at the top of the fixed disc, and the mounting ring is fixedly mounted at the top of the fixed disc through a bolt. A filter screen is movably mounted at the top of the mounting ring, connecting rods are symmetrically welded to the inner wall of the mounting ring, limiting holes are formed in the outer walls of the connecting rods, fixing blocks are fixedly mounted at one ends of the connecting rods, through holes are formed in the middles of the fixing blocks, and the through holes penetrate through the fixing blocks; the problem that the working efficiency of workers is reduced due to the fact that a filter cake is generally adopted for filtering in the using process of a traditional filter, the service life of the filter cake is limited, meanwhile, the fil