The invention discloses an application of molasses in chromium-polluted soil remediation and a remediation method. The molasses are used for remediation of the chromium-polluted soil. The remediation method comprises the specific steps of: pretreating the chromium-polluted soil, preparing molasses agent, determining the added amount of the molasses agent, mixing the polluted soil and the molasses agent, reacting the polluted soil and the molasses agent, conserving the remediated soil and detecting the concentration of chromium pollutants in the soil at the later stage to ensure the stability. The application and the remediation method disclosed by the invention have the advantages that the molasses are used as a biochemical reduction agent in the chromium-polluted soil remediation, and the remediation efficiency is high; due to addition of the molasses, an organic carbon source and trace elements are provided for native-bacteria type microorganisms in the soil, the breeding metabolism of the microorganisms is promoted, and the biological remediation action is enhanced; in addition, the source of the molasses is wide, the price is low, no negative and positive ions are introduced, and the soil structure after remediation is improved, so that the improved soil is beneficial to following development and utilization, can be used for large-scale engineering implementation and can effectively prevent secondary pollution.