The invention relates to the technical field of wind power generation equipment, in particular to a single-frame type impeller of a wind turbine. An existing horizontal-axis wind turbine affected by the structure and materials is low in wind utilization rate, high in design requirements, heavy and large, difficult to maintain and easy to overspeed and gallop. The single-frame type impeller of the wind turbine comprises a wind wheel frame, a vane adjusting device, a support and diagonal support rods, wherein the vane adjusting device is connected with the support and assembled at the front end of a turbine spindle, the wind wheel frame is connected with the support via the diagonal support rods, and vanes are assembled in the wind wheel frame and around the vane adjusting device via shafts, the vane adjusting device is provided with a closed adjusting chamber, and a gear type or connecting rod type adjusting mechanism is assembled in the adjusting chamber. By changing the vane connecting mode, the number of the vanes is increased, wind energy utilization efficiency is improved, output power of the wind turbine is increased, volume, height and weight of the wind turbine are reduced, and the single-frame type impeller is reasonable in structure and convenient for daily maintenance and overhauling.