Polyethylene composition as well as preparation method and packaging product thereof

The invention belongs to the technical field of polymers, and discloses a polyethylene composition and a preparation method and a packaging product thereof, the polyethylene composition comprises the following components: a component A: low density polyethylene, the density of which is 0.890-0.930 g/cm < 3 >, and the melt index of which is 1-5 g/10 min under the conditions of 190 DEG C and 2.16 kg load; the component B is an ethylene-vinyl alcohol copolymer, the molar fraction of an ethylene comonomer is 25-50%, and the melt index of the ethylene-vinyl alcohol copolymer is 3-8 g/10 min under the conditions of 210 DEG C and 2.16 kg load; the component C is maleic anhydride grafted polyethylene wax, the acid value of the maleic anhydride grafted polyethylene wax is 25-50 mgKOH/g, the weight-average molecular weight of the maleic anhydride grafted polyethylene wax is 3000-7000, and the grafting rate is greater than 3%; optionally component D: an additive. The polyethylene composition has high barrier property to