The invention provides a method for preparing tung oil and a drying device using the same, belongs to the agricultural product processing method and the processing device, in particular to a method for preparing the tung oil by using fruits of a tung tree as a raw material and a drying device using the same. The invention provides the method for preparing the tung oil with short process flow, high yield and high raw material utilization and the drying device used in the method. The method for preparing the tung oil is as follows: drying husky tung seeds serving as a raw material through drying, cleaning dust and impurity, cooking, pressing, filtering and refining. The method is characterized in that: in the drying step, the tung seeds are baked with hot air for 8 to 12 hours on the slope of a barrier board in the drying device which separates a case body into an upper layer and a lower layer in the case body. In the method, the husky tung seeds are used as the raw material, four steps, such as husking, husk and kernel separating, crushing and decoloring, are not required. Therefore, the method has short process flow and high raw material utilization, and labor, time and energy are saved. The drying device performs drying by adopting upper and lower air intake, so the thermal efficiency is improved, the drying time is shortened, and the energy is saved.