The invention discloses a fixed pitch asynchronous wind turbine modeling method which comprises the following steps that firstly, a wind turbine generator capture power equation is established; secondly, a wind speed change dynamic process equation is established; thirdly, power conversion characteristics of a wind turbine generator are fitted; fourthly, a wind energy transfer process time lag equation is established; fifthly, the wind turbine generator capture power equation, the wind speed change dynamic process equation, the power conversion characteristics of the wind turbine generator and the wind energy transfer process time lag equation are utilized to complete fixed pitch asynchronous wind turbine modeling. The fixed pitch asynchronous wind turbine modeling is achieved, and the advantages of providing accurate data for stable analysis of a power system and power grid production dispatching are achieved.