Abstract: The converter slag is rich in metal oxides, trace elements and minerals, which has high recycling value. The hot disintegrating process of converter slag is gradually applied to the pretreatment process of steel slag for its advantages of environmental protection, a low consumption and high recovery rate. This article briefly introduces the composition and performance of converter slag, some influencing factors of its quality, the theorem and the current situation of the hot disintegrating process. The key emphasis has been put on the research of a company optimizing its traditional technology of hot disintegrating converter slag to achieve a breakthrough in advanced treatment process of putting converter slag on-line directly by pouring steel slag into several different pits, pumping water in multiple sections, using broken jaws and magnetic separation after fine grinding by rod mills. It not only solves the problems of slag's hardening in the pit and red blocks after simmering, minimizes the particle size of tailings, maximizes the amount of metal iron recovery, but also reduces dust pollution and the waste of external drainage resources. The process realized that the direct on-line ratio of the slag pit was over 43%, the on-line rate of decarburization was over 76.3%, the particle size of the crushed tailings was less than 10 mm, and the iron content of the treated tailings was less than 1.06%, which greatly improved the metal recovery rate, and had guiding significance for the recycling of steel slag.