Polyethylene and method for preparing the same

A polyethylene polymer satisfying the following requirements of i) to v):

• i) density measured at 23° C. according to ISO 1183-2 being 0.945 to 0.960 g/cm3;
• ii) a melt flow rate_(MFR) measured at 190° C. under load of 2.16 kg according to ASTM D1238 being 0.4 to 2.0 g/10 min;
• iii) a melt flow rate ratio (MFRR) of MFR-5/MFR2.16 being 3.0 to 5.0, wherein MFR5 is a melt flow rate measured at 190° C. under load of 5 kg according to ASTM D1238, and MFR2.16 is a melt flow rate measured at 190° C. under load of 2.16 kg according to ASTM D1238;
• iv) a molecular weight distribution of Mw/Mn being 7.0 to 15.0, wherein Mw is a weight average molecular weight, and Mn is a number average molecular weight;
• and
• v) an integral value of an area where Log Mw value is 6.0 or more in a gel permeation chromatography (GPC) curve graph being 2.0 to 7.0% of an entire integral value.