Montmorillonite desiccant is developed by exploitation of natural Montmorillonite ores and using such techniques as high temperature heating, organic carbonization, Montmorillonite swelling, streaming treatment, drying, activation, crushing, and screening concentration. It is a natural, nontoxic, innocuous, degradable, healthy, green and environmentally friendly desiccant with no additive, corrosive material or chloride. The product quality complies with China's military standard of GJB2714-96 and American military standard of MIL-D-3464E.