The invention discloses an industrial furnace with a waste gas purifying device. The industrial furnace comprises a furnace body; the middle end of the top of an inner cavity of the furnace body is fixedly connected with a circulating fan; the left side of the inner cavity of the furnace body is fixedly connected with a heating wire; sleeves are fixedly connected to the periphery of the bottom of the furnace body; the top ends of inner cavities of the sleeves are movably connected with support legs through springs; rollers are movably mounted at the bottoms of the support legs; a movable door is movably mounted at the lower end of the right side of the furnace body; and an observation hole is formed in the upper end of the right side of the furnace body. An inner cavity of a physical filter box is fixedly connected with an activated carbon filter layer and a KDF filter layer in sequence from top to bottom for absorbing impurities in waste gas to achieve the effect of primarily purifying the waste gas; an acid and alkali neutralization tank can perform the second-grade purification on the waste gas; and meanwhile, pine barks and peats can micro-organically degrade the waste gas, so that the problems of environmental pollution and threat on the health of people due to a lot of poisonous and harmful gas generated in the combustion process of the industrial furnace are solved.