The utility model discloses a throttling device capable of meeting the requirements for high-pressure-difference small flow and low-pressure-difference large flow. The throttling device is characterized by comprising an upper sleeve, a valve element, a valve rod, a throttling plate, a lower valve seat, a taper pin and an inner hexagon screw. The valve rod is connected with the valve element in a welded mode, the valve element is placed in the upper sleeve, and the upper sleeve, the throttling plate and the lower valve seat are each provided with a plurality of pin holes and screw holes. The throttle plate is installed between the upper sleeve and the lower valve seat, and the upper sleeve, the throttle plate and the lower valve seat are fixedly connected through taper pins and socket headcap screws. The device is simple in structure and convenient to disassemble and assemble; by adopting the valve structure of the sleeve, throttling of the sleeve is specially designed, and multistagepressure reduction of the throttling plate is achieved through the design of the labyrinth disc. A plurality of small holes are formed in the bottom of the sleeve, and large-flow control and flow transition connection are achieved in a throttling mode of punching the small holes.