The invention discloses a wind power plant reactive compensation control method which includes the steps of 1 installing a voltage transformer to test real-time voltage at the position of a wind power grid-connection busbar, 2 comparing a detected real time voltage measured value at the wind power grid-connection point and a given reference value of the grid-connection point voltage, so that total reactive power values required by a power grid are obtained after a proportional integral (PI) controller processes differential signals, 3 installing an electric current measurement element to detect rotor current ir at the position of a doubly-fed fan rotor winding, carrying out a subtraction operation between the rotor current value ir and the limit current value icmax of a converter beside a rotator, if the result is bigger than zero, the protection action signal Crowbar of the side rotor of the doubly-fed fan rotor is one, or the protection action signal Crowbar of the lateral rotor of the doubly-fed fan rotor is zero; 4 distributing reactive power and other steps, solving the problems of increasing investment cost of the wind power plant through current external equipment, or a certain limitations brought by that the method utilizes the reactive power adjustment ability of a lateral stator of the doubly-fed fan stator.