The invention relates to a wind turbine generator generation power determination method and device, and the method comprises the steps: obtaining the current wind speed of a wind turbine generator ina wind power plant, and determining the wind speed state of the current wind speed of the wind turbine generator through a pre-established wind speed determination neural network model; Determining the power generation power of the current wind speed of the wind turbine generator according to the wind speed state of the current wind speed of the wind turbine generator; The power generation power of the current wind speed of the wind turbine generator is obtained through the current wind speed of the wind turbine generator, and the accuracy of the power generation power of the current wind speed of the wind turbine generator is improved.