The invention discloses a kidney-protecting assistant treatment instrument for kidney cancer treatment, wherein the kidney-protecting assistant treatment instrument mainly comprises a rear cover plate, a front cover plate, a back massage plate, a fumigation device and a back fixing plate; the interior of the back massage plate is hollow, and a plurality of gas bag columns are arranged at equal intervals on the inner side face of the back massage plate, and a massage layer is arranged on the right side of the back massage plate; a gas-guide tube is arranged at each of the left end and the rightend of the interior of the massage layer, each gas-guide tube is divided into a main pipe and a branch pipe, a plurality of pneumatic massage devices are arranged on the main pipe at equal intervals,and a plurality of pressure control valves are arranged on the branch pipe at equal intervals; the rear cover plate and the front cover plate are connected back and forth through a connecting belt and an adhesive layer; the middle of the rear side face of the rear cover plate is provided with the fumigation device; the upper end of the fumigation device is connected with the lower end of the backmassage plate; the back fixing plate is connected with the upper end of the back massage plate through two elastic belts at the lower end. In a word, the kidney-protecting assistant treatment instrument is convenient and simple to use, and can effectively alleviate the pain of patients and promote the restoration of patients with kidney cancer.