The invention discloses an enhanced dephosphorization reactor. The reactor body comprises, from bottom to top, a water distribution zone, a reaction zone and a precipitation zone in sequence, wherein the lower part of the water distribution zone is equipped with a returned sludge hopper, a mixing chamber is arranged at the upper part of the returned sludge hopper and a jet water inflow device is arranged at the center of the returned sludge hopper; the reaction zone is equipped with, from inside to outside, a first reaction zone, a second reaction zone and a third reaction zone in sequence, and a chemical agent inflow pipe is located at the lower part of the first reaction zone; and the precipitation zone is equipped with, from bottom to top, a sludge discharge port, a precipitated sludge hopper, a sludge precipitation chamber, an overflow weir and a water outlet in sequence, and a saw-toothed overflow mouth is formed at the upper part of the overflow weir. The enhanced dephosphorization reactor combines thawing agglomeration dephosphorization, flocculation dephosphorization and crystallization dephosphorization, realizes the complementation of all functional units, has the advantages of compact structure and small occupation area; in addition, jet water inflow is adopted to enhance the mixing effect of wastewater and chemical agents, promote the reflux of the precipitated sludge for recovery and enhance dephosphorization effect; the solid-liquid separation effect is improved by the synergy of crystalline column layer filtration and inverted triangle sedimentation separation of the precipitation zone; and the precipitated sludge has high phosphorus content.