The invention discloses a dephosphorizing granular activated coke adsorption tower with a fluidized bed. The dephosphorizing granular activated coke adsorption tower comprises a tower body, wherein a water inlet is formed in the upper part on the inner wall of the tower body; a plurality of branch pipelines are communicated with the water inlet; a plurality of water distributors are arranged in the tower body, are in one-one correspondence with the branch pipelines, and are combined, arranged and distributed according to a matrix; the coverage area of the water distributors is not less than 90% of the sectional area of a filter layer; the tower body is filled with granular activated coke; a granular activated coke lifting passage is arranged outside the tower body. Wastewater to be treated is pumped into the dephosphorizing granular activated coke adsorption tower via a water pump, passes through the branch pipelines in the tower body, and enters the bottom of the granular activated coke to be pre-filtered, the pre-filtered wastewater passes through the water distributors which are arranged and combined under the granular activated coke according to the matrix, and uniformly passes through the filter layer, and the filtered water flows out uniformly, so that the purpose of removing total phosphorus in wastewater is realized due to the adsorption function of the granular activated coke, and the requirement of small occupied area can be met under the premise of meeting the special requirement of a large quantity of phosphorus wastewater; the operation is simple; the labor intensity is low; the wastewater treatment cost is low.