The invention discloses a processing method of white mulberry root bark and wild rice stem honeydew, and belongs to the field of beverage processing. The processing method comprises the following processing technologies: adopting wild rice stems, cleaning the adopted wild rice stems and cortex mori radicis, precooking the cleaned wild rice stems and the cortex mori radicis, mashing the precooked wild rice stems, squeezing the juice from the mashed wild rice stems, compounding the mashed wild rice stem juice, the cortex mori radicis juice, licorice roots, fructose, citric acid, lemon essence, rose jam, platycodon grandiflorum particles and sea buckthorns juice so as to obtain compounded liquid, homogenizing the compounded liquid, degassing the homogenized liquid, sterilizing the degasses liquid, filling the sterilized liquid, press covering the filled liquid, and inspecting the covered liquid. The processing method disclosed by the invention has the benefits that the white mulberry root bark and wild rice stem honeydew not only is delicious, and rich in nutrition, but also can complement nutrient substances required by human bodies, and has the efficacies of clearing heat, removing toxicity, quenching thirst, easing constipation, strengthening the organism, beautifying the features and reducing blood lipid. The white mulberry root bark and wild rice stem honeydew is convenient to eat, is simple to operate, and is a green beverage which is delicious and rich in nutrition.