The invention relates to a metallocene polyethylene composition being easy to process and a preparation method of same and belongs to the field of high-molecular materials. The metallocene polyethylene composition is composed of, by weight, 100 parts of mLLDPE resin, 0.15-1.0 part of polyethylene glycol, 0.08-1.0 part of calcium stearate, 0.02-0.8 parts of zinc stearate, 0.02-0.08 parts of antioxidant 1076, and 0.06-0.24 parts of antioxidant 168. The metallocene polyethylene composition is simple in preparation method, has low cost and is environment-friendly. The preparation method can improve the processability of the material and significantly reduces melt viscosity of mLLDPE, which is beneficial to shaping process of the resin at low temperature and reduces energy consumption and shear heating during the processing. A thin film prepared from the composition is significantly improved in optical performances without reduction on strength. Processing efficiency of metallocene polyethylene is improved.