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The invention discloses a three-stage hydrator for preparing hydrated lime. The hydrator comprises a tank body, wherein a feed port and an exhaust port are formed on the top of the tank body; a discharge port is formed at the bottom of the tank body; three layers of partition boards are arranged inside the tank body from top to bottom; passages are formed between one ends of the partition boards and the side walls of the tank body; the passages of the adjacent partition boards are staggered with each other; the partition boards divide the inside of the tank body into first-stage hydration chambers, second-stage hydration chambers and third-stage hydration chambers which are respectively provided with a stirring shaft; stirring blades are distributed on the stirring shafts; axial directions of the stirring shafts are the same as the flow direction of a medium; the stirring shafts are respectively driven by motors; the passages between the partition boards inside the first-grade chambers and the side walls of the tank body correspond to the feed port; and a plurality of observation windows are formed at one side of the tank body. By controlling a plurality of procedures for the inside of the multi-stage dry powder hydrator, such as reasonable water allocation, burnt lime is hydrated to fluffy hydrated lime dry powder with the water content being controlled within 1.5%; and an hydrated lime emulsion at a certain concentration can be prepared according to requirements.