The invention discloses a garbage bin provided with a plastic bag replacement device, which comprises a shell and a plastic bag box arranged inside the shell. Rotating plates are hinged on two mutually parallel inner walls of the shell, and a limiting plate is arranged below the rotating plate. , the limit plate is inclined upward; the sum of the upper surface area of the rotating plate is not less than the cross-sectional area of the inner space of the shell parallel to the horizontal plane, and the edge of the movable end of the rotating plate is rounded; the plastic bag box includes a base, and the bottom of the base is provided with Suction cup, a housing is installed on the base, a top cover is arranged on the top of the housing, an opening is opened on the top cover, an accommodation cavity is arranged in the top cover, a spring is arranged in the accommodation cavity, and the spring is in a compressed state; it also includes a telescopic plate , one end of the telescopic plate is located in the accommodating cavity and is connected with the spring, and the other end is located in the opening. The invention effectively saves plastic bag rolls, improves the application range of the device, and has extensive popularization value.