Abstract: In order to solve the problems of non-uniform wind speed and flow field in steam blanching and hot air vacuum drying equipment, improve the uniformity of the hot air drying process of drying equipment, computational fluid dynamics was used to simulate and analyze the flow field of hot air drying process, and three improvement schemes were proposed, and four groups of models were selected for each scheme. By comparing and analyzing the velocity uniformity and flow field distribution of each group of models, the velocity non-uniformity is taken as the index; it is obtained that the optimal model is to install a nozzle baffle with a width of 11mm at the rear end of each nozzle outlet, and its velocity non-uniformity coefficient is 10.4%, which is 23.61% lower than the model before improvement, greatly improving the uniformity of hot air drying. Finally, the improved model was tested and verified. The relative error between the simulated value and the measured value is within 10%, and the difference between the simulated value and the measured value is small, indicating that the model is accurate.