The utility model relates to a mop which can be used as a tool for cleaning a floor and a brick or for waxing. A cloth clamping device controlled by a knob is composed of a knob, a pressing strip, a guide rail, etc., and can easily, firmly and directly clamp and be removed from various towels, flannelette, sponge or cloth made of other fabrics; a soft cushion is arranged out of a mopping plate to be tightly attached to the floor to effectively sweep hair, dust, dirt, etc., from the surface of the floor; a connecting device is composed of a shaft base, a rotary block, a connecting piece, an adjusting washer and a mop handle, the shaft base, the rotary block and the connecting piece are movably connected together to control the mop to rotate arbitrarily on the floor, and the connecting piece can be connected with the mop handle with various diameters conveniently.