The invention discloses a method for fluidization removal of magnesium from a phosphate ore. The method comprises the steps: grinding a raw phosphate ore into a phosphate ore powder, then adding water, and adjusting into a slurry; then adding the phosphate ore slurry and a magnesium removal liquid into a fluidization magnesium removal tower, mixing, and generating a reaction; successively carrying out solid-liquid separation, washing and drying on the phosphate ore slurry after magnesium removal to obtain a phosphate ore concentrate; adding an acid respectively into a magnesium-containing solution a obtained from solid-liquid separation of the phosphate ore slurry and the washed water of the phosphate ore slurry to prepare magnesium removal liquids; and carrying out shunting treatment of the reacted liquid after magnesium removal. The fluidization technology is applied in the phosphate ore magnesium-removal process, and parameters of each process step are controlled, the content of available phosphorus in the phosphate ore concentrate after treatment is 32% or more, and the content of magnesium oxide is 0.65% or less.