The utility model discloses a coal ash wet granulation device, and belongs to the technical field of coal ash granulation. The granulating device comprises a storage bin, a granulator, a reaction kettle and a finished product bin, the storage bin is communicated with a working cavity of the granulator and feeds materials into the working cavity, and a material outlet of the granulator is connectedwith the finished product bin; the reaction kettle is used for stirring and heating a binder, and an outlet of the reaction kettle is communicated with the granulator through a liquid conveying pipe;and the granulator is used for mixing the fly ash and the binder and granulating. The device can process the powder coal ash into spherical coal ash particles meeting long-distance direct transportation, the granulation efficiency is high, and the transportation cost is saved.