The invention discloses a wind driven generator. The wind driven generator comprises a tower drum fixed to the ground, a cabin located on a tower frame, a power generator arranged in the cabin, a rotor which rotates relative to the cabin and comprises a plurality of rotor blades, and an air circulation system used for deicing the blades and enabling the blades, the cabins and the tower drum to communicate. The air circulation system comprises a controllable air inlet formed in the position, away from the cabin by a certain distance, of the tower drum, an air filter arranged on the upper portion of the air inlet, a heater arranged on the upper portion of the air filter, and an internal heat exchanger used for heat exchange with the power generator in the cabin. Airflow circulation passages are arranged in the blades. Through the airflow circulation passages, airflow entering the blades flow through blade tips firstly and then flow through roots, and the airflow is exhausted out through small holes in the roots. By the adoption of the deicing system, the temperature, cleanliness and flow of air entering the cabin are controlled more effectively, the system does not occupy any space of the cabin, and the overall deicing effective is better.