The paper aims to improve the waste of cooling capacity and decline of freezing quality caused by uneven freezing by studying the performance and freezing effect of the common fluidization quick freezer. In this paper, combination of experiment and numerical analysis is used to optimize the energy-saving design of fluidized freezers that are common on the market. By studying the influence of the position and angle of the deflector on the freezing effect, the best design plan for the deflector is found, then fluidization quick freezer before and after optimization is verified by experiments. The position combined with the best uniformity is that the deflector 1 at 0.23 m with 45° and the deflector 2 0.095 m with 25°. The optimized machine has better cooling uniformity, and the temperature drop at different points at the same time is reduced by about 50%. The time required for the optimized machine to drop to −35 C is about 3.5 minutes less than it for the previous machine to this temperature. Compared with the machine before optimization, the freezing time of a batch Downy Groundcherry has been shortened by 6.2%; the power consumption of no-loaded machine's temperature required for pre-cooling has been saved 14.2%; the power consumption of freezing a batch Downy Groundcherry has been saved 33%. The optimized air flow uniformity of the machine has been improved and energy saving has been achieved.