The invention relates to the technical field of traditional Chinese medicine decoction pieces, in particular to radix angelicae sinensis traditional Chinese medicine decoction pieces and a preparationmethod thereof. The preparation method comprises the following steps of A, material selection and washing; B, infiltration; C, slicing and steaming; D, vacuum freeze drying and smashing; E, encapsulation; F, drying and tabletting. The preparation method is simple in process, the operation is easy to control, the production efficiency is high, and the cost is low; through encapsulation, active functional ingredients in radix angelicae sinensis are effectively protected, the water content is equal to or lower than 4.5%, the ligustilide content is 57.83%-58.64%, the ferulic acid content is 0.061-0.073%, the radix angelicae sinensis traditional Chinese medicine decoction pieces prepared by using the method are easy to dissolve and easy to digest and absorb, the dissolution rate is 97.25-98.88%, and bacteria are not easy to breed. The content of aflatoxin B1 is 1.6-2.3 microgram/kg, the shelf life is long, the quality is stable and the preparation method can be used for massive industrialproduction.