The invention provides a method for reducing the content of cadmium in corn through intercropping with Sedum plumbizincicola and coupling with a passivator. The method comprises the steps that the intercropping mode that the corn is planted on ridges, the Sedum plumbizincicola is planted in furrows between every two adjacent ridges is adopted, and while a base fertilizer is applied to the ridges where the corn is planted, the passivator LH or the passivator LS or the passivator SH is applied, wherein the passivator LH refers to 150 kg/mu of lime and 1500 kg/mu of humic acid, the passivator LSis 150 kg/mu of lime and 1500 k/mu of sepiolite, and the passivator SH is 1500 k/mu of sepiolite and 1500 kg/mu of humic acid; in the corn stem pushing stage, a phosphatic fertilizer and a potash fertilizer are applied to the corn, and only a base fertilizer is applied to the Sedum plumbizincicola. By means of the method, under the condition that the corn yield and the farmers' income are ensured,compared with corn sole cropping without the passivator, corn sole cropping with the passivator and intercropping of the corn and the Sedum plumbizincicola, the pollution of the cadmium to corn kernels can be greatly reduced, and moreover, the ecological environment is protected.