Flapping wing aircraft is a new type of unmanned aerial vehicle derived from the theory of bird bionics. The periodic flapping of the wing provides the lift and thrust forces that are required by the aircraft. This new aircraft has a wide application prospect in the field of military and civil aircrafts. The aerodynamic measurement of the flapping wing aircraft is an important means for the aerodynamic testing. The accurate measurement of the multi-dimensional aerodynamic force can provide the experimental data for the optimization of the new flapping wing design and the improvement of the flight control quality. This paper introduces a new modular multi-dimensional small-scale dynamometer platform, which can realize the measurement of six-dimensional aerodynamic and aerodynamic moments of flapping wing aircraft. Considering the purpose of measuring dynamic force load of flapping wings, the Ansys Workbench finite element analysis software was used to analyze the modal and frequency response of the dynamometer platform, and the frequency response is obtained at the working frequency. The vibration characteristics of the force platform meet the design requirements.