The temperature distribution inside the drum of tea cylinder water-removing machine is the main factor affecting the quality of the tea. In view of the defects of the current tea cylinder water-removing machine, including the uneven water-removing and low thermal energy utilization, a tea cylinder water-removing machine was designed with infrared radiation as the heat source in the present study. The infrared heat source was placed in the center of the cylinder. The approach of combining EDEM and Fluent was used to analyze the discrete field, flow field and temperature field during the de-enzyme process The turbulence model and the radiation model were installed in the software Fluent, then the contact model of tea leaves and cylinder was established by the discrete element software EDEM. The temperature distribution of the flow field in the drum and the temperature rise curve of de-enzyme green leaves were obtained through coupled calculation, realizing the numerical simulation of the de-enzyme process, then the simulation results with the same type of electric heating machine were compared. The simulation results showed that the temperature flow field of electric heating structure was evenly distributed in the drum, and the utilization rate of heat energy was low. While filming for the infrared temperature distribution in the flow field in the cylinder was mainly concentrated in the right and bottom rollers, and could put most of thermal radiation on the steamed directly. With the utilization of the high heat energy, the editing device could make the steamed quickly to heat up and warm effect, thus the enzyme activity was passivated in a short time, improving the quality of the tea. The relative error between the measured temperature and the simulated value was about 0.99%, indicated a reasonable parameter setting.