Provided are a wind farm noise prediction method, apparatus and system. The method comprises: collecting, in real time, a wind speed at a site of at least one wind turbine generator system, which impacts noise at a noise detection point, in a wind farm; according to a noise acoustic power level database and a system database, respectively calculating a noise acoustic power level, at the collected wind speed, of each wind turbine generator system from among the at least one wind turbine generator system; according to a wind farm noise propagation database, respectively calculating a noise propagation loss value, at the collected wind speed, of each wind turbine generator system; and using the noise acoustic power level and the noise propagation loss value of each wind turbine generator system to calculate a total noise acoustic pressure level at the noise detection point.