The invention relates to a drying device of prepared common monkshood daughter roots and a using method thereof, and the drying device is characterized in that the drying device comprises a rack, material collection slots are arranged on two sides of the rack respectively, an infrared electric heating device is arranged at the top of the rack between the two material collection slots, a mask covered therein is arranged at the top of the heating device, the heating device is connected with a temperature control device, and a PID feedback controller is arranged in the temperature control device for carrying out the feedback control on the temperature. The drying device carries out the even heating on the mask through an infrared radiation heat source device, and then the heating is carried out on the prepared common monkshood daughter roots which are well dip-bleached through the whole heated mask, thereby greatly improving the product quality and leading the dried prepared common monkshood daughter roots to have high white degree of color and luster, good taste and beautiful appearance. The drying device of the prepared common monkshood daughter roots is applicable to drying the common sage herb type and the flower type medicines, in particular to drying the materials which need the instantaneous dehydration and have higher requirements on the shape.