The invention discloses an air flow drying equipment discharge hole structure improvement method based on a fastest falling line and a discharge hole structure of the air flow drying equipment discharge hole structure improvement method. The air flow drying equipment discharge hole structure improvement method is characterized in that a fastest falling line principle is applied to carry out structure improvement design on a four-edged table-shaped discharge hole of the traditional air flow drying equipment to obtain a fastest falling line curved surface; and the curved surface is installed on one side, with material deviation, of the outlet of the drying equipment to acquire the transformed discharge hole structure so as to regulate a flowing direction of a cut tobacco material in the discharge hole and reduce the phenomenon of material deviation. The air flow drying equipment discharge hole structure improvement method based on the fastest falling line and the discharge hole structure have the advantages that 1) with the discharge hole improved according to the method, the material deviation phenomenon of the discharge hole of the air flow drying equipment can be effectively improved, and very small influence is caused on intensity of pressure in the system at the same time, so that the moisture uniformity and stability of the cut tobacco material are improved, the processing quality of cut tobaccos are improved, and the raw material utilization ratio is increased; and 2) the discharge hole structure is simple in design and convenient to process.