Fiber ball filter is spherical filter knotted by fiber,compared with traditional rigidity filter,has good elasticity,no floating, long working period and small head losses. In the filtering process, filter layer gap along the flow direction is becoming smaller, more accord with ideal filter material by big under small porosity distribution, thus forming the filter speed fast, cut pollution, large capacity, filtering effect is good, renewable repeatedly used and don't change entirely and save Labour, etc.