The invention relates to a linear low density polyethylene-nylon 6 alloy used for rotational molding, which is characterized in that: according to quality proportion, the components of the alloy are 100 portions of linear low density polyethylene and 10-30 portions of graft polymer, LLDPE-g-AA 0-20 nylon 6. The invention has the advantages that: the adding of the graft polymer LLDPE-g-AA 0-20 substantially increases the mutual interaction of the two phase interfaces of LLDPE/PA6; when the added amount of PA6 is 10 percent and the graft polymer LLDPE-g-AA is 5 percent, the impact strength of simple beam gap of alloy system is enhanced to the highest, which increases 170 percent compared with LLDPE, and other mechanical properties of the alloy material are increased to a certain degree.