The utility model relates to an adjustable combined throttling device, comprising a throttling stem, a mounting main body, a pipe plug, a male screw of the throttling stem connected with a female screw at the left end of the mounting main body, a male screw of the pipe plug connected with a female screw at the right end of the mounting main body, an output on the mounting main body, a clip groove on the throttling stem, a throttling nozzle mounted in the throttling stem and screwed with the throttling stem. It is only necessary to exchange the throttling nozzle but not exchange the throttling stem when adjusting the flow rate. The material cost is low. Because the volume of the throttling nozzle is small and the throttling nozzle is easily subject to reinforcement and surface hardness is greatly increased, the service life is greatly prolonged. The adjustable combined throttling device has obvious economic benefit.