Intravascular flow limiter used for treating hypersplenism and preparation method thereof

The invention relates to an intravascular flow limiter used for treating hypersplenism and a preparation method thereof. The intravascular flow limiter used for treating hypersplenism is made of spirally wound metal wire, and comprises a blood flow-in support section, a blood flow-out support section, and a flow-limiting diameter reduced section arranged between the blood flow-in support section and the blood flow-out support section in communication with the blood flow-in support section and the blood flow-out support section; the internal diameter of the flow-limiting diameter reduced section is smaller than the internal diameters of the blood flow-in support section and the blood flow-out support section; the blood flow-in support section, the flow-limiting diameter reduced section andthe blood flow-out support section are coaxial; and smooth transition connection is adopted for both the connection between the blood flow-in support section and the flow-limiting diameter reduced section as well as the conne