The invention discloses a multi-medium filter and a filtering method thereof. The multi-medium filter comprises a multi-medium filter body; the multi-medium filter body is provided with a filter layer, a backwashing outlet, a material outlet, a material inlet, a sealing gasket, a top cover, a stud assembly, a handle, a plug, an emptying hole, a wall plate, a screen, a lifting device installation groove, a lifting device and a filter layer frame; the multi-medium filter body is obtained by carrying out integrated design on multiple multi-medium filters which are installed at the same time, so that the total occupied space is saved, the pipeline connection is reduced, and workshop production and transportation are facilitated; the integrated multi-medium filter is evenly divided into a plurality of chambers, and the geometrical shapes of the chambers are the same as one another, so that a modular design is facilitated; a water inlet distributor and a water inlet hole are connected with each other by means of screw threads, a hoop or the like, so that the structure is detachable, and the filling and replacing of filtering mediums are facilitated.