Air nozzles are the key constructional elements of the lithium battery films drying cabinets and have a great effect on drying efficiency and effectiveness even the running of whole drying system. The steady state flow fields of three kinds of air nozzles are obtained through numerical simulation method. This paper provides an investigation of the resistance characteristics and flow equalization characteristics of different air nozzles, and gives the theory basis for the selection of air nozzles in actual working condition.