As a 42 bit * high-throughput fully automatic digestion furnace in the fields of agriculture, tobacco, soil, food, etc., it is compact in design, saves space in the fume hood, and has a temperature control accuracy/repeatability/uniformity of ≤ 0.5 ℃. It can automatically lift the sample tube and exhaust absorption hood, avoiding manual operation in high temperature and strong acid environments. The digested samples can be used for applications such as Kjeldahl nitrogen determination or mobile phase analysis.