The embodiment of the invention discloses a grate closed-die forging technology. The grate closed-die forging technology comprises the steps that material selecting and feeding are conducted; multi-stage medium frequency heating is conducted, and oxide skins are removed; a lubricant and a releasing agent are used, and bar stocks are put into a die after the die is preheated; and after the surfacesof the bar stocks are lubricated through the glass lubricant, the die is closed. The closed die is included and comprises an upper die sleeve connected with an upper die, a lower die sleeve connectedwith a lower die, a concave die and a convex die; the upper die sleeve is provided with a fixing plate for being connected with the upper die sleeve and the convex die, an elastic cushion is arrangedbetween the convex die and the fixing plate, and the convex die is installed on the fixing plate through a hold-down nut; the bottom of the lower die sleeve is provided with a plurality of ejector rods at equal intervals, through column holes for installing the ejector rods are formed in the lower die sleeve, and the edge of the periphery of the upper surface of the lower die sleeve is provided with an air compression groove, air inflation holes are formed in the position, at the bottom of the interior of the air compression groove, of the lower die sleeve, and the air inflation holes extendto the through column holes; and the structure strength of existing grates during forging is improved, and the number of times of forging in the forging process is decreased.