The work aims to solve the problem that the feeding system of weighing sensor calibration device is subject to vibration of the motor frequently during actual operation, thus possibly causing the resonance of the detection device. The three-dimensional design software PROE was used to establish the three-dimensional model for the feeding system of weighing sensor calibration device. The dynamic characteristic analysis and the transient analysis of the feeding system of weighing sensor calibration device were conducted in combination with the finite element simulation technology, and the modal analysis results were tested and verified. The results showed that, when the external excitation frequency was close to the fifth-order modality (412 Hz) of the feeding system, the deformation and stress of the feeding system were larger. Therefore, in the actual working environment, the operations of weighing sensor calibration device in the vicinity of the fifth-order (412 Hz) modal frequency should be avoided.