Abstract: A safety system for wind turbines and a wind turbine fitted with this safety system. The safety system comprises a propeller shaft adapted to be solidly connected to a wind turbine rotor, an adjustment shaft movable with respect to this propeller shaft for adjusting the pitch angle of at least a rotor blade, actuating means connected to the adjustment shaft for moving it and triggering means of said actuating means being normally disconnected to said actuating means until to overcoming a certain speed of the propeller shaft. The peculiarity of the wind turbine safety system is that triggering means comprise mechanical means connected to the actuating means through direct drive transmission as to overcoming said certain speed for moving said actuating means until rotor blades being safety set. This solution ensures the safety system maximum effectiveness and certainty of operation.