Filtering and purifying device convenient for dismounting and replacing filter screen

The utility model relates to the technical field of filtering and purifying devices, in particular to a filtering and purifying device convenient for dismounting and replacing a filter screen, which comprises a purifying box, a fixing mechanism is arranged in the middle of the lower end of the purifying box, the purifying box is slidably connected with a filtering mechanism through a sliding chute, and a motor is fixedly arranged on the middle upper part of the right end of the purifying box. A first rotating column is movably connected to the lower middle portion of the right end of the purifying box in a penetrating and inserting mode through a bearing, transmission wheels are fixedly connected to the right portion of the outer surface of the rotating column and the right portion of the outer surface of the first rotating column, and the outer surfaces of the two transmission wheels are jointly in transmission connection with a conveying belt; and the middle left parts and the middle right parts of the oute