Over-wide polyethylene greenhouse film resin composition and preparation method thereof

The invention provides an over-wide polyethylene greenhouse film resin composition and a preparation method thereof. Given the weight of linear low-density polyethylene (LLDPE) is 100wt%, the resin composition comprises the following components: 1, 100% of LLDPE; 2, 0.12-0.45wt% of compounded crosslinking auxiliary; and 3, 0.015-0.032% of dibenzoyl peroxide; in the composition, the compounded crosslinking auxiliary is compounded from 1,1-dimethyl-ethyl-hydrogen peroxide (TB) and 2,5-dimethyl-2,5-di-tert-butyl peroxide hexane (DBPH), and the mass ratio of the two crosslinking auxiliaries is (7:1)-(5:3). The melt strength of the composition is improved by more than twice and can be used for producing an over-wide greenhouse film with thickness not less than 80 mu m and width not less than 14m, and few 'fisheyes' are on the surface of the greenhouse film.