The work aims to study the effects of mixing ratio of waste box board paper and digital printing waste paper on the properties of foaming materialand determine the optimum fiber mixing ratio. A kind of waste paper fiber foaming material was prepared by microwave foaming method withwaste box board paper and digital printing waste paper as main raw materials. The microstructure of foaming material was observed by macro lens and scanning electron microscope. The results showed that when the ratio of waste box board paper fiber and digital printing waste paper fiber was 12.5:2.5, the material hadthe best comprehensive performance, the density was 0.112 g/cm3, the foaming ratio was 1.728, the deformation energy was 6.463×104 J/m3, and the buffer coefficient was 5.922. The foaming material prepared by mixing two kinds of waste paper fibers has low density, high foaming ratio and good buffering performance.