A high-temperature online sterilization machine includes transmission box connected to rear axle assy of a tractor, front chain wheels driven by a power shaft in the transmission box, housing connected to the transmission box, and two sides of the housing connected rotatablely with two ends of a transmission shaft. The two ends are provided with a front chain wheel respectively, two sides of the housing are connected with rear chain wheel respectively, and the inner ends of the rear chain wheel shafts are connected with a rolling barrel. A group of fuel gas spray guns are arranged on the front portion of the housing, and are connected respectively with a reducing valve arranged on a fuel gas storage tank through gas pipes. Flames sprayed out of the fuel gas spray guns are matched with soil turned over by scraper plates of the rolling barrel in a heating mode.
