Abstract: The present invention provides a kind of pail for squeezing water from a mop, the pail has a rectangular shape, on the mouth of the pail are mounted a pair of rollers both of which can freely rotate themselves with one of them being able to be moved transitionally, and the other is rotatably fixed. A pedal means making use of lever principle is provided on both outer sides of the pail wall, When a mop absorbing plenty of water is lifted from between the two rollers from the pail, a user can step down the pedal plate of the lever means to make one movable roller move translationally and press the mop tightly against the rotatably fixed roller, due to the friction force between the mop and two rollers when the mop is lifted upwards, the rollers rotate themselves, thereby water is squeezed out by the pressure. When the pedal plate is released, under the action of the restoring spring, the whole apparatus can return to its original position.