In this paper, a new flexible microgripper structure with twostage amplification is designed, and its displacement amplification ratio is studied. Firstly, the overall structure of the microgripper with twostage amplification is designed. The first stage amplifying mechanism adopts a lever mechanism, and the second stage adopts a halfbridge amplification mechanism. Then, the stiffness matrix method is used to model and analyse the flexible mechanism of the microgripper, and a vibration differential equation of the microgripper with three degrees of freedom in the plane is established. Based on the obtained equation, the displacement amplification ratio of the microgripper is calculated. Finally, the displacement amplification ratio obtained by the model is verified by the finite element method and the experimental method. The results show that the model analysis, finite element analysis and experimental results are in good agreement, which proves the feasibility and validity of the flexible microgripper mechanism and the modelling method.