Turntable shafting axis wobble error is an important technical index of inertial testing equipment. The calculation model of axis wobble error was actively discussed, and a finite element model was established based on Link element to simulate the ball bearing contact between ball-inner and ball-outer ring.On this basis, combined with the radial runout vector figures of the inner ring of the left and right supports, the theoretical value of the synthetic axis wobble error was calculated.Finally, under no-load and on-load conditions, the horizontal shaft axis wobble error was tested by the national military standard autocollimator-planar reflector method.The results show that,in combination with the finite element model of shafting deflection angle based on the Link element simulation of the ball bearing and the rotation error caused by the radial runout of the bearing inner ring,the error between the predicted value of the model and the experimental value is less than 9% by using the inclination rotation error method. Therefore, this calculation method can be used to effectively evaluate the inclination rotation error of turntable shafting and to guide the optimal design of shafting structures.