The invention discloses a method for processing bupleurum medicinal slices in producing areas. The method comprises the following steps of: cleaning, namely removing impurities of fresh bupleurum medicinal materials, cleaning and removing residual stems; moistening for 10 to 30 hours; slicing; and drying. The method for processing the bupleurum medicinal slices in the producing areas has simple processes, and is easy to operate and suitable for industrial production, the loss of medicinal materials is small, and the consumption of time, labor and resources are saved by at least a half while the administration of clinical prescribed medicines and Chinese patent medicinal raw materials is safe and effective. Meanwhile, the bupleurum medicinal slices prepared by the method are high in quality, the content of bupleurum volatile oil and total saponins is high and uniform; and the difference of the content of medicinal ingredients of the bupleurum medicinal slices in the same batch is small, and the dissolution degree of saponins is high, so that the saponins are convenient to medicate and process further.