The invention discloses a specially-prepared large-diameter sand filling model device for physical simulation experiments and a method thereof, wherein the device includes a model pipe body; the modelpipe body comprises a main pipe body; the main pipe body is a cut-through pipe body, the left end and the right end of the main pipe body are respectively blocked with a left pipe end seal cover anda right pipe end seal cover; the inner end face of the left pipe end seal cover is provided with a left screen pressing plate, and a coarse screen and a fine screen are respectively mounted between the inner end face of the left pipe end seal cover and the left screen pressing plate; a right screen pressing plate is mounted at an inner end face of the right pipe end seal cover, and a coarse screenand a fine screen are respectively mounted between the inner end face of the right pipe end seal cover and the right screen pressing plate; the main pipe body is provided with a simulation injection-production well hole or a pressure measuring hole. The device and the method not only can simulate the edge-bottom water characteristics of an actual oil reservoir, but also can simulate the artificial gas-cap drive characteristics of a mine field.