The invention discloses an ultrasonic excitation signal interference shielding method for wind speed monitoring in a wind power station. The starting time of an FPGA is controlled to control a measuring module to be started, namely an enabling signal of the measuring module is made effective at a set moment; the enabling signal of the measuring module is a square wave with a fixed frequency; the waveform of the square wave is adjusted according to an input instruction received by a judgment module. The starting time of the measuring module is controlled by controlling the enabling signal of the measuring module, so that when an interference signal arrives, the measuring module is closed, and therefore the purpose of shielding the interference signal is achieved.