In order to solve the problem of long computation time for solving the winding vibration field by the traditional finite element full-order model, which can’t be used to quickly solve the twin model, this paper proposes to apply the computational method combining Proper Orthogonal Decomposition (POD) with the structural dynamics governing equation is applied to the calculation of transformer winding vibration field, so as to realize the rapid calculation of winding vibration field under different working conditions and meet the real-time requirements of digital twin technology. By establishing a finite element reduced-order model of the winding vibration field, the implementation process of digital modelling and mapping of the winding vibration field is proposed, and the axial vibration displacement distribution of the winding of a 10/0.4kV transformer is calculated. The computational accuracy of the reduced-order model established by intercepting different numbers of POD reduced-order modes is analyzed, and the solution time is compared with that of the full-order model. The results show that the computational accuracy of the second-order and third-order reduced-order models can be approximated to be equivalent to the full-order model, and the error of 0.01%; On the basis of satisfying the accuracy, the lower-order model has a higher computational efficiency. Compared with that of the full-order model, the efficiency of the second-order reduced-order model is increased by 98.2%.This method can provide technical support for the rapid calculation of transformer winding vibration field and digital analysis of power equipment.