Provided is a pharmaceutical composition for preventing or treating liver fibrosis, comprising a GPR119 ligand as an active ingredient. The composition comprising the GPR119 ligand as an active ingredient significantly inhibits the expression of collagen I, transforming growth factor β (TGFβ) and α-smooth muscle actin (α-SMA), thereby inhibiting HSC activation, and also significantly inhibits HSC proliferation. Therefore, the composition may be effectively applied in improvement, prevention, inhibition or treatment of liver fibrosis