The invention relates to a needle type locating adjustable hydraulic type clamp for machining of a tenon of a precisely forged blade. The needle type locating adjustable hydraulic type clamp comprises an installation base, a locating device, a clamping device, an auxiliary supporting device, a main controller and a control loop. As a blade body is located and clamped from multiple points, the locating and clamping stability is ensured, self-adaption auxiliary supporting is provided for the tenon, reactive force is provided, cutting deformation is offset, the rigidity of the blade is improved, machining is more stable, and the milling accuracy of the tenon is improved. Influence on the quality of the blade body from a traditional process can be avoided, machining efficiency is improved, and machining cost is lowered. The digital control technology is adopted, the degree of automation is high, operation is easy and convenient, and large-scale production is facilitated.