CATALYST COMPOSITION FOR PREPARING CONJUGATED DIENE POLYMER AND CONJUGATED DIENE POLYMER PREPARED BY

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The present invention provides a catalyst composition for preparing a conjugated diene polymer and a conjugated diene polymer prepared by means of same, the conjugated diene polymer comprising a functional group agent in the following chemical formula (1) as well as a rare earth metal compound, an alkylating agent and a halogen compound, showing excellent catalyst activity and polymerization reactivity, and having high linearity and excellent processability. Chemical formula (1) : (X1)a-M1-([Y-M2-(X2)n-1])m-a, wherein a, m, n, M1, M2, X1, X2, and Y are as defined in the description.