The invention relates to the field of polymerization reactions and discloses an ethylene polymerization method and polyethylene produced therefrom. The ethylene polymerization method includes the steps of: in the presence of a catalyst, polymerizing ethylene under polymerization reaction conditions, wherein a catalyst contains a spherical zeolite mesoporous composite material and magnesium salt and/or titanium salt supported thereon. The spherical zeolite mesoporous composite material contains zeolite and a mesoporous molecular sieve material having a three-dimensional cube-cage pore structure. The invention also discloses polyethylene produced through the method. By means of the ethylene polymerization method, a polyethylene product being low in bulk density and melt index and being not liable to break can be produced.