Degradable environment-friendly flame retardant and preparation method thereof

The invention discloses a degradable environment-friendly flame retardant and a preparation method thereof, and relates to the technical field of flame retardants. When the degradable environment-friendly flame retardant is prepared, firstly, calcium sulfate whiskers and tetrabutyl titanate react to prepare composite whiskers, and the composite whiskers sequentially react with tetraethoxysilane, epoxypropyltrimethoxysilane and chitosan oligosaccharide to prepare modified composite whiskers; the preparation method comprises the following steps: reacting lysine polypeptide, phosphorous acid and formaldehyde, and then reacting with urea to obtain modified lysine polypeptide; and reacting the modified composite whisker with the modified lysine polypeptide to prepare the degradable environment-friendly flame retardant. The degradable environment-friendly flame retardant prepared by the preparation method disclosed by the invention is applied to rubber, so that the rubber has excellent flame retardance, tensile pro