The utility model provides a fluid flow control device and a valve cage applied to the dame. The valve cage comprises a hollow cylinder, a noise reduction component, a high-flow component and a conversion portion. The noise reduction component is provided with a plurality of inlets, a plurality of outlets and curved flow paths extending between the inlets and the outlets. The high-flow component is axially arranged closely to the noise reduction component and comprises a first shaft end, a second shaft end and a plurality of main flow openings. The conversion portion is limited on the interface between the noise reduction component and the second shaft end of the high-flow component and comprises a plurality of conversion openings. Each conversion opening comprises a groove in the end of the high flow component, so that the valve cage with zero dead-zone is arranged between the noise reduction component and the high flow component when the conversion component is used for the fluid flow control device.