The levitation characteristics of the levitation rotor of the diamagnetic levitation airflow energy harvester were analyzed.After selecting the appropriate levitation distance,the influences of two different coil arrangements and coil structure parameters on the output characteristics before and after optimization were analyzed.COMSOL 5.5 was used for finite element simulation analysis.It is found that the induced voltage and average power show the characteristics of first increasing and then decreasing as the outer diameter of the coil increases.The coil layout and structural parameters were gotten when the output voltage was the highest.Finally the coil outer diameter is determined to be 6 mm,the wire diameter is 0.02 mm,and the number of turns is 600.The harvester outputs a peak voltage of 2.33 V and an average power of 0.32 mW at 2 000 r/min.