The invention relates to the technical field of garbage inlet devices of a negative-pressure garbage storage box of a garbage sweeper. A garbage sweeper provided with a negative-pressure garbage storage box with an adjustable inlet gap is characterized in that in the sweeping process, when the garbage sweeper encounters large swelling garbage, such as tree leaves and plastic bags, and an absorbing negative-pressure pipe can smoothly pass, the garbage inlet gap enlarging device can be used, the garbage feeding gap can be opened, so that the gap is enlarged, and the garbage can be conveniently sucked into the negative-pressure garbage storage box for road surface cleaning; an opening and closing device is obtained through pushing and pulling, rotary tooth inner and outer turnover pates or a vertical sliding structure, and the problem that sweeping is conducted when a garbage sweeper encounters the large swelling garbage and an absorbing negative-pressure pipe can smoothly pass, but the garbage sweeper cannot successfully and completely clear away the garbage because an existing unchanged garbage inlet gap is too small; the garbage sweeper provided with the negative-pressure garbage storage box with the adjustable inlet gap solves the problem and reduces the labor intensity of cleaning workers.