The work aims to solve the problems that the pre-cooling time of litchis is difficult to be controlled during the post-harvest pre-cooling process, and the long pre-cooling processing time leads to high pulp temperature. By studying the relationship between the temperature change and time of litchi pulp in different environments, the temperature drop and rise experiment of litchi pulp were designed. The temperature change process of litchi pre-cooling and drying packaging stage was simulated. And the litchi pulp temperature prediction model under time series was proposed. Experimental results showed that the predicted value of litchi pulp temperature change based on the time series model was highly consistent with the experimental value, and the mean variance was more than 80%, indicating that the prediction results were stable and reliable. In the pre-cooling environment of ice water at 2-3 °C, it took about 14 min for the litchi pulp temperature to be reduced from 26 °C to 5 °C, and the drying treatment time controlled within 4-6 min at room temperature (25 °C) after pre-cooling could effectively reduce the problem of high pulp temperature before litchi storage, improve the pre-cooling effect of litchi ice water, and ensure good quality of litchis. Construction of the time series model to study the change characteristics of pulp temperature during litchi pre-cooling process can provide a reference basis for control of process parameters in pre-cooling, drying and packaging of litchis.