Abstract: A filter apparatus for treating material comprises a filter cylinder, a hollow valve plate mounted rotatably in the center portion of the filter cylinder and having a filter mesh provided thereon, and a hollow shaft connected to the valve plate to cause the valve plate to rotate and discharging a filtrate therethrough. The filter apparatus is preferably provided with a vibrator to cause the filter mesh to be vibrated and an auxiliary filter equipment to improve filtering efficiency. The material is filtered, dehydrated and dried on the filter mesh in one process, and then is dropped from the filter mesh by rotating the filter mesh, thus the treated material is obtained.