The utility model discloses a throttle valve system, comprising a plurality of paths of passages connected to an upstream straight pipe section in parallel, wherein each path of passage comprises a flow regulator, a flow nozzle and a fast change-over valve which are connected in sequence, each path of the fast change-over valve is communicated with a downstream straight pipe section through a buffer, and each fast change-over valve comprises a full-on state and a full-off state. The throttle valve system meets the basic theory of engineering thermodynamics, and can continuously change the through-flow area, so that the fluid flow is adjusted, the throttling loss is effectively reduced, and the requirements of energy saving and emission reduction are met to the greatest extent.