The invention discloses a choline chloride water dispersible granule / tablet and a preparation method thereof. The choline chloride water dispersible granule / tablet comprises, by mass, 0.1-80% of choline chloride, 0.5-16% of a dispersant, 0.5-9% of a wetting agent, 0.5-25% of a disintegrating agent, 0-12% of a binder, and the balance filler. The preparation method of the granule / tablet comprises the following steps: mixing all the above raw materials composing the choline chloride water dispersible granule / tablet, carrying out ultramicro / airflow crushing, granulating, drying, granulating / tabletting, carefully choosing, and detecting. The choline chloride water dispersible granule / tablet has the advantages of safety to the environment, humans, animals and other beneficial organisms, difficult generation of the phytotoxicity, metering accuracy, use convenience, fast disintegration speed, good storage stability, and simple preparation technology, and is suitable for the industrialized production and the agricultural large-area popularization application.