The invention discloses a method and a system for optimizing a wind turbine generator phase-locked loop parameter. The method comprises the following steps that: solving the characteristic equation ofa phase-locked loop transfer function, and obtaining the parameter which affects a phase-locked loop response characteristic; simulating wind turbine generator phase-locked loop operation environmentto regulate the parameter which affects the phase-locked loop transfer parameter; and according to simulation, obtaining a phase position tracking result, and determining an optimal phase-locked loopparameter. By use of the method, the best phase-locked loop parameter can be selected, the blind amplification of the phase-locked loop parameter is avoided, phase-locked loop phase position trackingperformance under a voltage phase position hop situation of the power grid is improved, the transient characteristics of the wind turbine generator is improved, and parameter selection convenience isboth given a consideration on the basis of meeting the phase tracking accuracy of the phase-locked loop.