Aiming at the shortcoming that the GMA has too small displacement under special working conditions, a lever-type flexible hinge micro-displacement amplifying mechanism was designed. Through the combination of theoretical calculation and finite element analysis, the correctness of the design was verified, and the test platform was set up to test the output performance of the amplification mechanism driven by the giant magnetostrictive actuator. The results show that the designed flexible hinge-type amplification mechanism displacement amplification ratio can reach 5.32, the equivalent stiffness is 1.29 N/μm, and the mechanism has strong load capacity, small displacement loss and high output efficiency.