The invention relates to a trommel screen device and a method used for sorting domestic garbage. The device comprises a roller brush, a roller, a speed reducer, a motor, a scraping plate, a base, screen meshes, a guide plate, a screening hopper and a riddling outlet, wherein the screen meshes are circular holes, the aperture is 80mm, and the aperture ratio is 75 to 85 percent; both sides of equipment are respectively provided with the telescopic roller brush and the scraping plate, which can clear obstacles in the screen meshes and burs outside the roller; and the entire trommel screen deviceis horizontally arranged, the guide plate is arranged inside the roller, and the domestic garbage in the roller turns and moves forward along the guide plate. When the device is used for sorting the domestic garbage, the rotational speed of the trommel screen is controlled to be 10 to 20r/min, and the sorting efficiency of the domestic garbage with the grain diameter below 80mm is as high as 93 percent. The domestic garbage sorting method involved with the invention has high efficiency, low energy consumption and easy maintenance.