A control method for improving electric generation performance of a wind turbine generator in a frozen environment comprises the following steps: 1) judging the running region of the wind turbine generator; 2) if the wind turbine generator runs in a region I, controlling a model to run according to the conventional variable speed; 3) if the wind turbine generator runs in a region II, correcting anoptimal gain coefficient kopt to improve the electric generation efficiency of the wind turbine generator; and 4) if the wind turbine generator runs in a region III, carrying out variable-speed control by an automatic optimization control mode to capture energy to a maximum extent; and if the wind turbine generator runs in a region IV, carrying out stopping protection. Various control modes are adopted according to different degrees of ice coverage of blades, the electric generation performance of the wind turbine generator which runs in the frozen environment is improved, and safe and stablerunning of the wind turbine generator is ensured.