The pore size controllable filter can separate and remove effectively the suspended solid and eliminate rapidly it captured by the device. The filtering materials ( 21 ) are built on the upper filtering material holder ( 23 ) and the lower filtering material holder ( 24 ) of radial type facing each other at a certain distance in the filtering tub ( 2 ), forming a filtering layer ( 21 a). According to the direction and the degree of rotation of the upper handle ( 28 ) connected to the upper rotation axis, the filtering materials ( 21 ) come together to the center along the upper filtering material holder ( 23 ) and the lower filtering material holder ( 24 ). Then one side or both sides are twisted in opposite directions and concentrated around the perforated pipe ( 22 ) located at the central axis or restored to the original state. Accordingly, the size of the pore created between the filtering materials ( 21 ) can be adjusted, enabling to conduct filtering and washing operations at a proper level.