A sponge fixing mechanism for sponge mop includes a first fastener and a second fastener. The first fastener has a chute and a mating surface in the chute. The chute has an outlet and an inlet respectively located at two opposite ends of the first fastener. The second fastener has a mating surface and is installed in the chute and detachably fastened to the first fastener with the mating surface thereof in sliding contact with the mating surface of the first fastener. One of the first fastener and the second fastener has a latching recess recessed from the mating surface thereof. The first fastener and the second fastener are fastened together by elastically engaging the latching protrusion into the latching recess.