The utility model relates to a high-pressure digesting hot spraying tank for the ultra-short cycle hot-spraying wood-grinding pulping paper-making by using a poplar and a dahurian larch. The utility model is characterized in that the upper part of a tank body forms a cylindrical body; the lower part forms a funnel-shaped conical body; the top part of the tank body is provided with an elliptical feed inlet; the inner part of the feed inlet is provided with an elliptical sealing cover which is larger than the feed inlet; a sealing mouth is fixed by a screw nut through a strip-shaped fixing plate of a screw rod sheathed on the sealing cover; the tank bottom mouth is connected with a ball-shaped valve; the ball-shaped valve is connected with a ' L-shaped ' material spraying pipe by a joint of a different-diameter expanding pipe. The hot spraying tank has the advantages that the structure is simple, the operation is convenient, the fibre single cells of the paper making raw material of the ultra-short cycle can be isolated, the cells are ruptured, the interleaving of the cells are better in the process of pulping, the quality of the paper-making is improved, and the environmental pollution is prevented.