The embodiment of the invention provides a voltage stabilization analyzing method and device for a power system of a wind power plant. The method comprises: selecting continuous parameters to form a new equation, expanding the flow equation of the power system by using the new equation, correcting the expanded flow equation of the power system to obtain corrected flow equation of the power system, wherein in the corrected flow equation of the power system, the corrected flow jacobian matrix is the flow jacobian matrix generated when the node in the power system with maximum reduced voltage amplitude value is processed as the node with appointed injection power and voltage amplitude value; using a Newton-Raphson algorithm iteration to solve the corrected flow equation of the power system so as to obtain a prediction direction; determining a predication point according to the prediction direction and a preset step size; and analyzing the voltage stabilization condition of the power system of the wind power plant according to the prediction point. According to the scheme of the invention, the convergence of the continuous flow calculation nearby the critical point is greatly improved; and the reliability of the algorithm is greatly improved.