The utility model discloses a crystallized phosphorus removing reactor. A crystallized phosphorus removing reactor main body is provided with a water distribution zone, a reaction zone and a sedimentation zone from bottom to top. The water distribution zone is provided with a dreg removing pipe, a water inlet pipe, a flow rising column disc type distributor and an aeration device. The aeration device is composed by the combination of an aeration pipe and an aeration head. A carrier inlet and a medicine inlet pipe are arranged at the lower part of the reaction zone. A first flow return pipe anda second flow return pipe are arranged at the upper and lower middle parts of the reaction zone. The sedimentation zone is provided with a water outlet weir, a water outlet pipe and a discharging opening. A saw-tooth type overflow weir is arranged at the upper part of the water outlet weir, two parallel baffles are arranged at the side face of the water outlet weir, and an inclined plate is arranged at the bottom part of the water outlet weir. The functions of the reactor is clear; the water distribution zone is provided with the flow rising column disc type distributor, which can effectivelyavoid short flowing of fluid; the reaction zone is provided with a carrier, which can intensify the crystallization of calcium phosphate; by adopting the running method of continuous charging and interval aeration, the reactor can prevent blockage of the carrier and is beneficial for the desorbing and recycling of crystals on the carrier; the sedimentation zone is provided with the saw-tooth baffle water outlet weir, so that the water outlet is uniform; as the inclined plate is arranged, solid-liquid separation is good.