Method for preparing polyolefin

A method for preparing a polyolefin comprising:

• providing a metallocene catalyst comprising a metallocene compound, a cocatalyst and a compound of Chemical Formula 1, which are supported on a support selected from the group consisting of silica, silica-alumina, and silica-magnesia in a single solvent-containing reactor, and
• polymerizing an olefin monomer in the presence of the metallocene catalyst:
• wherein, in Chemical Formula 1, R1 to R10 are each independently hydrogen, a linear or branched alkyl, alkoxy or alkoxyalkyl having 1 to 10 carbon atoms,
• R11 is a linear or branched alkylene group having 1 to 10 carbon atoms, or halogen,
• R12 and R13 are each independently a linear or branched alkyl group having 1 to 10 carbon atoms, or halogen, and
• X is a halogen atom,
• wherein, in the metallocene catalyst, the compound of Chemical Formula 1 is included in a molar ratio of 0.05 to 1 with respect to 1 mole of a transition metal contained in the metallocene compound,
• wherein an amount of hydroxyl group on the surface of the support is 0.1 to 10 mmol/g,
• wherein a weight ratio of the total transition metal included in the metallocene compound to the support is 1:10 to 1:1,000,
• wherein a weight ratio of the cocatalyst to the support is 1:1 to 1:100,
• wherein the step of polymerizing the olefin monomer includes solution polymerization including a step of performing slurry polymerization including a step of injecting a metallocene-supported catalyst in which the metallocene compound, the cocatalyst and the compound of Chemical Formula 1 are supported on the support, in the reactor, and performing slurry polymerization while adding the olefin-based monomer to the reactor.