The invention provides a method used for verifying wind speed and wind direction detection data accuracy of a boundary layer wind profiler radar. The method comprises the step that S1, from a wind speed and wind direction measuring device carrying a tethered balloon, wind speed and wind direction data of a certain height in a long time above detection area of the wind speed and wind direction measuring device are acquired; S2, the boundary layer wind profiler radar is arranged in the detection area, and real-time wind profiler data at the same height as the wind speed and wind direction measuring device are acquired from the boundary layer wind profiler radar; and S3, mean square error between wind profiler data at different heights and data of a wind speed and wind direction meter is calculated, so as to verify the wind speed and wind direction detection data accuracy of the wind profiler radar at a certain height. According to the invention, a tethered balloon system can be quickly arranged; the launch height covers the detection height of a conventional boundary layer wind profiler; the operation of height lift is flexible; wind speed and wind direction data in a fixed range can be accurately measured for a long time, and the accuracy is high; a lot of modification is prevented; the verifying cost is reduced; and the accuracy of data verifying is improved.