The invention provides a wind power plant output impedance frequency characteristic test analysis method. The method comprises the steps of obtaining a voltage sampling signal and a current sampling signal on a wind power plant bus according to a set sampling frequency when the voltage on the wind power plant bus changes due to the fact that a power system is disturbed by the disturbance signal and a disturbance source of the disturbance signal is located outside the wind power plant; respectively converting the voltage sampling signal and the current sampling signal into a corresponding voltage spectrum signal and a corresponding current spectrum signal through fast Fourier transform; calculating the ratio of the voltage value in the voltage spectrum signal to the current value in the current spectrum signal to obtain a plurality of continuous impedance values; and generating an output impedance spectrum curve of the wind power plant according to the obtained plurality of impedance values. The disturbance signals possibly appearing at any time in the power grid are used for collecting and sampling related electric quantity signals in real time, the output impedance frequency characteristics of the wind power plant are obtained through analysis and transformation, and therefore effective tools and means are provided for researching the impedance characteristics of the wind power plant.