Selenium-enriched slowly-released cadmium-blocking agent and preparation method thereof

The invention relates to a cadmium-blocking agent, in particular to a selenium-enriched slowly-released cadmium-blocking agent and a preparation method thereof. The selenium-enriched slowly-released cadmium-blocking agent comprises, by weight parts, 15-25 parts of selenium-enriched nanometer soil material, 70-85 parts of fermented organic material and 1-3 parts of microelement. The selenium-enriched slowly-released cadmium-blocking agent with a nanometer material as a carrier has the advantages of efficiently blocking cadmium and efficiently enriching selenium, the cadmium content of crops can be remarkably reduced, and the crop yield is greatly improved while selenium-enriched agricultural products are produced. According to the selenium-enriched slowly-released cadmium-blocking agent, through an integrated effect, the cadmium blocking cost can be reduced, the crop yield and quality are improved, and the selenium-enriched slowly-released cadmium-blocking agent is of great significance for guaranteeing nation