An orbital ring rotary flapping wing power device is composed of a support, an engine, a coupler, a main shaft, an orbital ring supporting frame, an orbital ring connecting body, an orbital ring connecting bearing, a core orbital ring, a sliding sleeve, a sliding sleeve support, a sliding block, a sliding block shaft, a sliding block shaft bearing, a small pulley, a driving rocker arm, a driving rocker arm bearing, a middle shaft connecting block, a driven rocker arm, a driven shaft connecting block, a blade distribution wheel, blades, a blade support, a blade far-end bearing and a sectional type self-combination fan blade. The orbital ring rotary flapping wing power device can effectively provide vertical take-off and landing power for an aircraft, has the advantages of being high in power generation efficiency, good in control effect, low in cost, wide in application scene and the like, and has very positive effects.