The invention relates to a drying device of Chinese herbal pieces, in particular to a multi-layer mesh belt type drying device which is simple in structure, uniform in heating, fast in drying speed, high in production efficiency and high in heat utilization rate. The multi-layer mesh belt type drying device comprises a drying box (3), a material feeding inlet (6), material discharging outlets (7), a first conveyor belt (5), a second conveyor belt (10), a third conveyor belt (11), a fourth conveyor belt (12), a fifth conveyor belt (13) and humidity outlets (4), wherein the material feeding inlet (6) is arranged at one side of the drying box (3), the material discharging outlets (7) are arranged at the lower part of the drying box (3), the first conveyor belt (5), the second conveyor belt (10), the third conveyor belt (11), the fourth conveyor belt (12) and the fifth conveyor belt (13) are arranged in the drying box (3), and the humidity outlets (4) are connected to the upper part of the drying box (3); the inner wall of the drying box (3) is provided with a far-infrared heating device (8), the material feeding inlet (6) is connected with a protection cover (9), and the inner part of the protection cover (9) is provided with a conveying device (2); the lower side of the protection cover (9) and the outer side of the drying box (3) are connected with an electric control cabinet (1). The multi-layer mesh belt type drying device disclosed by the invention has the beneficial effects that the structure is simple, the heating is uniform, the drying speed is fast, the production efficiency is high, and the heat utilization rate is high.