The invention discloses an intelligent monitoring device for blades of a wind driven generator, which comprises a blade body, a power generator, a plurality of fiber bragg grating sensors and a fiber bragg grating signal analyzer. The blade body is mounted on a hub, the power generator is connected with the hub through a gear box and a spindle or is directly connected with the hub, the fiber bragg grating sensors are arranged on the blade body, and the fiber bragg grating signal analyzer is connected with the fiber bragg grating sensors through optical fibers and an optical fiber coupler. Besides, wavelengths of different fiber bragg grating sensors on the blade body are different, the fiber bragg grating signal analyzer measures amplitude and frequency relations of corresponding temperature, vibration and dependent variables of optical signals of different wavelengths to acquire information about vibration, dynamic balance, fatigue, deformation, load and damage of the blade body, thereby assisting working staff to handle accidents in time.