Mechanical analysis is implemented on a multi-joint morphing wing trailing edge actuated by the shape memory alloy (SMA) wire. Utilizing the mechanics constitutive model of the SMA wire, a SMA-spring model is established in the condition of recovering under control. Moreover, the fluid-structure coupling model of the morphing trailing edge is used to evaluate the mechanical and aerodynamic performances in prescribed flight conditions. Hence, a series of flow-field grids for the deflected trailing edge are built by the grid-reconstruction technology.Basedon N-S equations, a flow-field solver is established to obtain the aerodynamic loads on envelops of morphing trailing edge. And then, the aerodynamic torque on every joint of trailing edge is calculated respectively, and with application of the ANSYS software, numerical simulations on the deflecting process of morphing trailing edge are performed. Through the above analysis, limit deflecting angles of the trailing edge are predicted. Finally, an experiment is carried out to verify the simulation results, and the experimental results show that the represented numerical method is feasible to predict the limit deflecting angles of morphing trailing edge accurately.