Wind speed detection system and wind speed detection method

A wind speed detection system and a wind speed detection method are provided. The wind speed detection system includes a pipe body, a pressure sensing module, an exhaust pump and a controller. The pressure sensing module is connected to a first opening through a first pipe, and is connected to a second opening through a second pipe. The first pipe has a main pipe. Two ends of a first replacement pipe are connected to two ends of the main pipe. When the controller performs a self-checking operation, the main pipe is closed and the first replacement pipe is turned on. The controller starts the exhaust pump for positive exhaust. The controller measures a first gas pressure through the first pipe through the pressure sensing module, and measures a second gas pressure through the second pipe. The controller calculates a reference wind speed value according to the first gas pressure and the second gas pressure.