Floor cleaner

The utility model discloses a floor cleaner which comprises a floor brush shell, a cleaning rolling brush, a sewage tank and a second pump, and the cleaning rolling brush is arranged at the front end of the floor brush shell; the floor brush shell comprises a sewage tank arranged above the cleaning rolling brush, the sewage tank is provided with a water inlet hole facing the cleaning rolling brush, and when the cleaning rolling brush rotates, liquid on the cleaning rolling brush enters the sewage tank through the water inlet hole; two opposite ends of the sewage tank are respectively communicated with an exhaust port of the second pump and the sewage tank; an air inlet of the second pump is communicated with the sewage tank; when the second pump works, negative pressure is generated in the sewage tank to suck sewage in the sewage tank into the sewage tank, and gas discharged by the second pump pushes the sewage in the sewage tank to flow towards one end, communicated with the sewage tank, of the sewage tank.