To solve the problem of system voltage instability caused by the increase of constant power load and motor load in multi-electric aircraft (MEA), a voltage stability enhancement method of distributed control system based on frequency division droop is proposed. The method calculates the port impedance of the equivalent power supply and the equivalent load of the system according to the small signal model of each unit, and analyzes the unstable frequency range of the system according to the impedance criterion. In view of the small damping and low stability of the system in a specific frequency band, the frequency division droop control method is used to correct it. The notch function is used to reduce the droop coefficient in the specified frequency band, thereby reducing the output impedance of the system equivalent power supply in the specified frequency band and improving the stability margin of the system. Finally, the PLECS simulation platform is used to verify the effectiveness of the method.