Green and low carbon is an important direction for the development of iron and steel industry. Aiming at the problems of low utilization rate of organic energy and serious secondary pollution of municipal solid waste at present, a new process of co-processing organic solid waste by pyrolysis and sintering is proposed. In this paper, organic solid wastes such as rubber, filter cloth and waste cloth are taken as objects, the optimal pyrolysis process system and sintering proportioning system of organic solid wastes are studied, and industrial experiments are carried out. The results show that, in laboratory research, the fixed carbon content of waste cloth in pyrolysis slag at 400 ℃ is high, its calorific value is high, and its properties are similar to those of coke. In industrial application, controlling the excess air coefficient to 0.45 and the pyrolysis temperature to 553 ℃ is a better working condition for the rotary kiln, which has the advantages of no kiln formation, low dioxin risk and more residual carbon in pyrolysis, and the residual carbon in pyrolysis can reach 53.95%. Replacing 7% coke powder in sintered material with 10% pyrolysis slag can reduce the consumption of solid fuel in sintering process, and at the same time, the finished product rate of sinter and drum strength hardly decrease, which is the best fuel structure system.