The embodiment of the invention provides a control method and a control device for a variable pitch system of a wind turbine generator set. The control method for the variable pitch system of the wind turbine generator set comprises the following steps: obtaining a shutdown mode of the wind turbine generator set; and according to the shutdown mode, controlling the variable pitch system to implement shutdown operation according to a first emergency shutdown process, or controlling the variable pitch system to implement sectional shutdown operation according to a second emergency shutdown process. According to the control method and the control device for the variable pitch system of the wind turbine generator set provided by the invention, corresponding shutdown operation processes are adopted based on different shutdown modes, so that the safety of the shutdown operation of the wind turbine generator set is improved, and the unit design load is reduced.