A type of parallel drive bidirectional deflection platform was proposed. The platform was mainly composed of a base, a slider, a motor, a drive arch, a circular arc guide, a pin shaft, a moving platform, a driving gear and a support plate. The moving platform in the platform was supported by two driving arches which were crossstaggered and concentric in space, and respectively guided by semicircular guides, driven by motor fixed with base. The motor was driven to realize the largeangle deflection of the platform around the X and Y axes, and the degree of freedom of the platform was calculated by using the modified Kutzbach-Grnbler formula. A special motion pair was designed in the platform to make the movement of platform simple and easy to control. The inverse equations of the position and velocity of the platform were given. The motion relationship and coupling characteristics were analyzed. The dynamics model of the platform was established based on the Lagrange method by using the principle of virtual work. Then the dynamic simulation of the platform was performed by using ADAMS. The variation curve of the motor output torque under different external loads was obtained. The mechanical properties of the platform were analyzed and the coupling relationship with the kinematics conclusion was obtained. Finally, based on the established dynamic model, the theoretical calculations under the same conditions as the simulated external load state were made to the platform, and the theoretical calculation results were compared with the simulated values. The simulation values and theoretical calculations under different external loads were calculated. The deviation between values was small and almost equal.