(57) The present invention relates to an ultra-high molecular weight polyethylene and a process for preparing the same, said ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 150-1000 ×10⁴ g/mol, a metal element content of 0-50 ppm, a bulk density of 0.30-0.55 g/cm³, a true density of 0.900-0.940 g/cm³, a melting point of 140-152°C, and a crystallinity of 40-75%, and said polyethylene satisfies at least one of condition (1) and condition (2):
Condition (1): tensile elasticity modulus is greater than 250 MPa, preferably greater than 280 MPa, more preferably greater than 300 MPa,
Condition (2): Young's modulus is greater than 300 MPa, preferably greater than 350 MPa.
The ultra-high molecular weight polyethylene has high mechanical properties, high melting point, low metal element content and ash content, and the preparation process is simple, flexible and adjustable, and the ultra-high molecular weight ethylene copolymer has a high tensile elasticity module.