The invention provides a clamping device of a blade type precision forging part. The device comprises a guide rail base, a fixing clamping end component and a mobile clamping end component, wherein the fixing clamping end component comprises a fixing end sliding block, a fixing end cover, a fixing end body and a plurality of positioning claws, and the mobile clamping end component comprises a main mobile end sliding block, a mobile end pushing component, a mobile end cover, a mobile end body and a plurality of positioning claws. According to the device, a plurality of positioning claws with pressure springs forms needle field type flexible clamping, when a complex part is clamped, a positioning claw at the position of the part moves towards a groove of the fixing end cover or the mobile end cover along a through-hole on a gasket, positioning claws at other positions can be formed along the geometrical shape of the outline of a part, a fixing end kidney-shaped pressing plate and a mobile end kidney-shaped pressing plate are fixed tightly through a fixing end kidney-shaped pressing plate pressing device and a mobile end kidney-shaped pressing plate pressing device, and the kidney-shaped pressing plates at two ends press the positioning claws on two ends respectively, so that the outline of the part can be maintained, and the part can be clamped.