From the seed oil of Celastrus angulatus, four new β-dihydroagarofuran sesquiterpene alkaloids were isolated. Their structures have been elucidated, on the basis of UV, IR, mass, 1D NMR and 2D NMR spectra, as 1β-acetoxy-9β-benzoyloxy-8α-hydroxy-13-nicotinoyloxy-β-dihydroagarofuran,1β-acetoxy-9β-benzoyloxy-8α(α-methyl-butanoyloxy)-13-nicotinoyloxy-β-dihydroagarofuran, 1β-acetoxy-9β-benzoyloxy-8α-isobutanoyloxy-13-nicotinoyl-oxy-β-dihydroagarofuran and 1β-acetoxy-8β,9β-dibenzoyloxy-13-nicotinoyloxy-β-dihydroagarofuran.