The invention relates to the technical field of biomass material processing, in particular to a processing method of a bamboo rattan. The method comprises the following steps: 1), removing impuritiesand cleaning bamboo stems and drying; 2), immersion treatment is carried out on a impregnation liquid, the impregnation liquid is mainly prepared from curcuma zedoary, sargentgloryvine stem, herba siegesbeckiae, pyrrosia lingua, fenugreek, uniflower swisscentaury root, ligusticum wallichii, pine needles, polygala tenuifolia, lysimachia foenum-graecum, pseudo-ginseng flowers, white orchid, rhizomacyperi, lavender and other raw materials; 3), fumigating treatment, a fumigant is mainly prepared from litsea cubeba, Cananga odorata, aglaia odorata, Cinnamomum camphora, thyme, sulfur and other rawmaterials; 4), drying and obtain the product. According to the processing method, The prepared bamboo rattan is soft in material, bright in luster and soft in quality, the bending performance is good,the special fragrance is achieved, the prepared bamboo rattan has the health-care effects of preventing bacteria, preventing insects, refreshing, aiding sleep, the effect is remarkable, the service life of the bamboo rattan is prolonged, moreover, the preparation method is simple and easy to produce.