The invention discloses a method of preparing polyacrylate super absorbent resin at a high temperature. The method comprises the following steps: adding a sodium hydroxide solution (50%) into an acrylic acid solution with a certain concentration to carry out neutralization reactions so as to obtain a neutral solution; when the temperature of the neutral solution is 50-90 DEG C, adding a crosslinking agent and other auxiliary agents into the neutral solution according to a certain ratio, carrying out reactions to obtain gel, wherein the final temperature of gelling reactions can reach 100-160 DEG C; grinding and extruding gel, drying, grinding, sieving, and finally carrying out secondary surface crosslinking to prepare the polyacrylate super absorbent resin. The heat of neutralization reactions is utilized, a crosslinking agent is added at a high temperature to carry out reactions, the energy consumption for cooling is reduced, and continuous production is guaranteed. Because the primary temperature of polymerization is high, the highest temperature of gelling reactions is high, a large amount of water is removed through evaporation, drying is promoted; the reaction time is short, the production efficiency is largely improved, the steps of nitrogen introducing and oxygen removing are not needed, and the production cost is reduced therefore.