The work aims to explore the effect of ambient relative humidity on the cushioning performance of a new kraft paper pad. Based on static and dynamic compression tests, the cushioning performance of kraft paper pads of 2, 3 and 4 layers was analyzed under 30%, 50%, 70% and 90% ambient relative humidity. In the static compression test, the static pressure bearing capacity of kraft paper pad decreased with the increase of relative humidity, but increased with the increasing superimposed layers. There were humidity stress boundary values of paper pads of different specifications. When the external force on the material was less than the humidity stress boundary value, the cushioning performance increased with the increase of humidity. When the external force was greater than the humidity stress boundary value, the cushioning performance decreased with the increase of humidity. Under certain humidity conditions, the number of superimposed layers also affected the cushioning performance of kraft paper pad. At 30% relative humidity, the cushioning performance decreased with the increase of the number of layers. At 50%, 70% and 90% relative humidity, there were stress boundary values corresponding to the number of layers. When the external force on the material was less than the stress boundary value of the number of layers, the cushioning performance decreased with the increase of the number of layers. When the external force was greater than the stress boundary value of the number of layers, the cushioning performance increased with the increase of the number of superimposed layers. In the dynamic compression test, with the increase of the ambient relative humidity, the maximum acceleration transmitted by the kraft paper pad to the product increased, and the cushioning performance decreased. The increase in the number of superimposed layers reduced the maximum acceleration transmitted to the product and enhanced the cushioning performance. The above results have potential guiding significance for the design and material selection of kraft paper pad cushioning packaging.