Wind driven generator overspeed safety control device

The invention discloses a wind driven generator overspeed safety control device. The wind driven generator overspeed safety control device comprises a sensor and a variable-pitch control system; the sensor is installed in a hub of a wind driven generator, connected with the variable-pitch control system and used for measuring running parameters of the hub to obtain a measuring result; and the variable-pitch control system is installed in the hub and used for obtaining the rotation speed of the hub according to the measuring result obtained through the sensor and judging whether the rotation speed exceeds a preset rotation speed threshold value or not, and if yes, stopping is conducted for feathering. According to the wind driven generator overspeed safety control device, the variable-pitchcontrol system is directly connected with the sensor, the variable-pitch control system has the calculating and judging capability on the measuring result of the sensor, the variable-pitch control system integrates the pitch