Oil tank and sweeper

The invention provides an oil tank and a sweeper. The oil tank comprises a tank body, a filter element assembly and a sealing cover, an oil storage cavity is formed in the tank body, an oil outlet isformed in the bottom surface of the tank body, and is provided with an oil plug, an oil return port and an oil suction port are formed above the oil outlet, an operation hole is formed in the side face of the tank body, the filter element assembly is arranged in the oil storage cavity and detachably connected with the oil return port and/or the oil suction port, the sealing cover covers the operation hole, and the sealing cover is detachably connected with the tank body. An oil return filter element is arranged in the oil storage cavity, so that the external space occupied by the oil tank canbe saved; the operation hole is arranged at the side of the tank body and the detachably connected sealing cover is matched, so that the oil liquid in the tank body can be discharged from the oil outlet at the bottom portion o