Blade tip clearance detection equipment and method for wind turbine generator

The invention discloses a blade tip clearance monitoring device and method for a wind turbine generator. The blade tip clearance monitoring device for the wind turbine generator comprises a positioning detection device, a monitoring device and a control device, wherein the positioning detection device is arranged on a blade of the wind turbine generator and used for monitoring relative position relation data between a blade root and a blade tip of the blade; and the processor is connected with the positioning detection device and used for determining whether the blade has the tower sweeping risk or not according to the relative position relation data detected by the positioning detection device and adjusting the state of the blade when the blade has the tower sweeping risk. According to the method, whether the blade has the tower sweeping risk or not is determined by detecting the relative position between the blade root and the blade tip, so that the tower sweeping risk of the blade can be judged when the bl