The invention provides a floor sweeper realizing self-washing of a mop. The floor sweeper comprises a machine body, a fork arm rack, a fork arm, a mechanical arm, a floor-sweeping device, the mop, a mop washing device, a wiping mop washing device, a garbage pouring mechanism, a correcting device and a double-axis-base mechanism, wherein the fork arm rack is mounted on a portal slideway in front ofthe machine body; the mop washing device comprises a mop washing pond, a dewatering device and a washing base; the floor-sweeping device can climb to the floor from a support plate positioned below the machine body under the control of a main machine, and performs floor sweeping in low space under a sofa and a counter; the fork arm lifts chairs and stools, a clamping claw at the front end of themechanical arm clamps shoes and baskets, so that the floor-sweeping device can conveniently sweep the floor positioned below; the washing base can pull out the dirty mop below the floor-sweeping device and then brings the dirty mop to the mop washing pond to be washed, after dewatering, the clean mop is inserted below the floor-sweeping device, so that the floor mopping is cleaner; a wiping mop ona wiping mop base can wipe tables and chairs, tea tables and table boards; the wiping mop base can bring the dirty wiping mop to a wiping mop washing pond to be washed and dewatered; and the fork armand the clamping claw are matched for pouring out garbage in a dustbin of the floor-sweeping device. The sweeper realizes multiple purposes.