Fixed wing structure of model helicopter

The utility model provides a fixed wing structure of a model helicopter, which comprises an exhaust tube. A top cover is disposed above the exhaust tube, an exhaust tube opening of the exhaust tube is connected with a wing portion, both the upper surface and the lower surface of the wing portion are planes, and the bottom of the top cover is circular. A propeller is replaced by the fixed wing portion, so that downward air exhaust of the model helicopter is eliminated, bottom dust flying is avoided, furthermore, forward or backward thrust can be provided for the model helicopter by the aid of rotation of left and right wings, and accordingly a small tail propeller is omitted. Besides, the fixed wing structure can be provided with four wings, and safe running of the model helicopter can be ensured as long as optional two opposite wings are not damaged.