The invention relates to an elastic C-shaped ring double-seat sealed cage type adjusting valve which comprises a valve seat and a valve body. The valve seat is arranged in the middle of an inner cavity of the valve body and a first graphite composite gasket is arranged in the middle of the valve body. A sleeve is arranged on the valve seat and an elastic C-shaped ring is embedded in a valve element assembly and an expansion ring and a guide ring are sequentially embedded into a groove of the valve element assembly from inside to outside. The valve element assembly is connected with a valve rod and installed into the sleeve together with the elastic C-shaped ring, the expansion ring and the guide ring. The valve element assembly adheres to a sealed face of the valve seat and a sealed face of the sleeve to form sealing. A second graphite composite gasket is installed between the upper portion of the inner cavity of the valve body and an upper cover. A third graphite composite gasket is installed between the upper portion of the sleeve and the upper cover. The upper cover, a packing pad, a graphite packing assembly, a packing gland and a packing press plate are sequentially arranged on a flange face of the upper end of the valve body from bottom to top. The elastic C-shaped ring double-seat sealed cage type adjusting valve is simple and compact in structure, high in universality and capable of overcoming the defect of a low leakage grade of a cage type double-seat adjusting valve and achieving stable and reliable operation of the valve.