In order to improve the numerical calculation accuracy of paper honeycomb sandwich panels and facilitate the selection of equivalent models for their different specifications， the corresponding equivalent accuracy of different equivalent models for the natural frequencies of paper honeycomb sandwich panels is analyzed with different structures. Firstly， the finite element models of the Reissner equivalent model， the Ekavall equivalent model and the Sandwich sandwich plate model are respectively carried out. Then， the modal analyses of the equivalent plate are compared with the experimental results， including the influence of different element side length， thickness and core paper weight on the accuracy of the equivalent model. Finally， the influence rules of these three variables on the calculation accuracy of different models are summarized， and on this basis the natural frequency analytical equation of honeycomb cardboard is obtained. The results show that the Reissner model is suitable for the paper honeycomb sandwich panel with its thickness less than or equal to 20 mm； the Ekavall equivalent model has the highest overall accuracy with error less than 10%； the Sandwich panel model has the highest accuracy as the cell side length of the paper honeycomb sandwich panel is 10 mm. In addition， as the cell side length and thickness are the same， the weight of core paper has little effect on the calculation accuracy. The errors between the analytical results and the experimental results from the equation are within 12.43%. This conclusion provides a basis for the selection of honeycomb cardboard model.