The invention relates to a high-efficiency box-type furnace with uniform
atmosphere filling. The high-efficiency box-type furnace comprises a main body, a preheating mechanism and a gas injection mechanism, wherein the gas injection mechanism comprises a supporting
assembly, a sealing sleeve, a rotating sleeve, a fixing rod, a
fan blade, a supporting net, two
gas transmission pipes and at least two gas inlet pipes; the preheating mechanism comprises a compression cylinder, a first pipeline, a second pipeline, a first one-way valve, a second one-way valve, a pressure
relief valve, a
piston block, a cylinder and a supporting rod; and the supporting
assembly comprises a supporting ring, two connecting blocks, two open grooves and at least two fixing blocks. In the high-efficiency box-type furnace with uniform
atmosphere filling, gas can be preheated through the preheating mechanism, so that the influence of the gas on the
internal temperature of the box-type furnace is reduced, and the heat
treatment effect of the box-type furnace on a
metal workpiece is improved; and the gas can be uniformly injected into the main body through the gas injection mechanism to make uniform contact withthe
metal workpiece, and therefore the heat
treatment effect of the box-type furnace on the
metal workpiece is further improved.