The invention discloses a Fenton fluidized bed biochemical tail water advanced treatment method and belongs to the field of wastewater treatment. The method comprises a crystal growth stage and a biochemical tail water advanced treatment stage; in the crystal growth stage, a Fenton agent is rapidly loaded on the surface of a filler and grow a crystal; in the biochemical tail water advanced treatment stage, the wastewater is oxidized and degraded by prolonging the time of the biochemical tail water staying in the fluidized bed and taking full advantage of the heterogeneous catalytic performance of the crystal growing on the surface of the filler, ferrous sulfate is not added in the treatment process any more, the target of discharging zero slags without producing iron cement or regulating acid-base is achieved, the method is economical, green and environment friendly, available cheap sands are chosen as the filler, the surface charge of the filler is negative and has a very strong combination action on iron oxide with positive charges, the more stable crystal is more rapidly formed, a better wastewater treatment effect is achieved, and the method is recycled, the service life is long, the design is reasonable, and the utilization ratio of the agent is high.