The utility model discloses a fiber filter tank for advanced sewage treatment. In the deep filtering process, the filtering efficiency is improved; non-clogging, the utility model relates to a filtertank, which is simple in structure and low in water head loss increase, can effectively improve the filtering speed, increase the treatment efficiency and reduce the occupied area of equipment, and comprises a tank body, a water inlet device, a filtering device, a back washing device, a water outlet, a back washing water outlet and an overflow port, wherein the water inlet device comprises a waterinlet and a back washing water inlet communicated with the tank body; the filtering device comprises a filtering material layer and a supporting layer which are positioned in the tank body, the filtering material layer is filled with a spherical fiber filtering material, and the supporting layer is a porous plate; the backwashing device comprises an aeration pipe, the aeration pipe is a breatherpipe with a plurality of air holes formed in one pipe wall, and the aeration pipe is connected with a fan; and the water outlet, the backwashing water outlet and the overflow port are communicated with the tank body.