An exponential composite lowfrequency piezoelectric atomizing nozzle with a frequency of 40 kHz was designed.The finite element model was established, and the vibration mode, resonance frequency, and atomization amplitude of the nozzle model were determined by modal analysis and harmonic response analysis of the nozzle model.When the mode was at the eighth order, the nozzle was in a purely tensile state with a resonant frequency of 39 550 Hz.When the voltage was set to 26 V, the simulated atomization amplitude was 3.9 SymbolmA@m.The vibration amplitude of the nozzle prototype measured by German Polytec highperformance singlepoint laser vibrometerranged from 3.94 Symbol to 4.32 Symbol, the error was less than 10%, which met the design requirements. The Malvine Spraytec laser particle size analyzer was used to measure the droplet uniformity of the prototype. When the driving voltage was 26 V, the droplet diameter generated by the nozzle atomization was Symbol（30～95） Symbol, accounted for more than 85%. The results showed that the droplet distribution of the spray nozzle was uniform.