The invention discloses a soil sample and plant sample digestion device. The device comprises a digestion tube and an electric furnace, wherein the digestion tube is mounted on a supporting frame through a clamping device; the clamping device is mounted at the upper part of the supporting frame; the electric furnace is arranged in the supporting frame; a triangular bracket is mounted above the electric furnace; the triangular bracket is fixedly connected with the supporting frame; an asbestos wire net is arranged on the upper surface of the triangular bracket; the digestion tube is clamped onthe supporting frame and then the lower end of the digestion tube is laid on the asbestos wire net. The device realizes the digestion of a soil sample or a plant sample by ensuring that the digestiontube is clamped on the supporting frame and the lower end of the digestion tube is supported on the asbestos wire net, ensures that the digestion tube is stable and reliable by supporting and clampingthe digestion tube, reduces the problem of sliding down of the digestion tube during the process of digestion, is safe to use, high in calorific capacity of the surface area of the electric furnace,can increase the quantity of digestion tubes, improves the utilization of the electric furnace, and is simple in operation process and convenient to manage.