It is of great significance to study the formation, transformation and volatilization of organic iodine in soil and its influencing factors in the migration and transformation of iodine in nature, ecological environment and human health. Based on previous studies on iodine in soil, this paper presents the morphology and concentration of iodine in the soil, focusing on the reaction mechanism between iodine and organic matter to produce organic iodine, the factors influencing the organization of iodine in soil and the volatilization of organic iodine in soil. IO_3- ^{and I}_-ⁱⁿ the soil undergo redox reactions to form intermediate substances (HIO, I₂), which are transformed chemically and biologically to produce organic iodine. A summary of the effects of soil pH, redox potential, organic matter content, enzymatic activity, Fe/Mn oxides and their hydroxide concentrations on organic iodine formation. The process of volatile methyl iodide production by microorganisms and higher plants in vivo was summarized. It is expected to provide data support and reference for the study of organic iodine in soil.