The invention provides a wind turbine generator control method, a wind turbine generator control device and a wind turbine generator control system. The method comprises the following steps of obtaining a detected low-temperature operation parameter; judging whether a low-temperature operation condition is met or not according to the detected low-temperature operation parameter; when judging that the low-temperature operation condition is met according to the detected low-temperature operation parameter, starting a low-temperature operation mode, wherein the low-temperature operation mode comprises the step of adjusting a blade of a wind turbine generator to be in a windward rotation state; and when judging that the low-temperature operation condition is not met according to the detected low-temperature operation parameter, starting a normal-temperature operation mode. When the low-temperature operation parameter meets the low-temperature operation condition by judgment, the low-temperature operation mode is started to adjust the blade of the wind turbine generator to be in the windward rotation state, so that the wind turbine generator is idle; and all parts of the wind turbine generator are rapidly heated by heat generated by mechanical rotation, the starting time of the wind turbine generator is shortened and the power generation efficiency is improved.