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1-(4-sulfonic acid) butyl-pyridinium hydrosulfate ionio liquid was synthesized and used as catalyst for producing biodiesel from swida wilsoniana fruit oil.The optimal reaction conditions of the transesterification were 5% catalyst using amount, 12:1 alcohol to oil molar ratio, 160℃ of reaction temperature and 5 h of reaction time.The conversion rate of fatty acid methyl ester (esterification rate) reached 93.2% under such reaction conditions.The physicochemical properties of the biodiesel produced were basically in line with the biodiesel standard of ASTM 6751-03a of America and the standard of 0# diesel of China.The used ionic liquid was retrieved and recycled for six times, during which the catalyst exhibited excellent reusability.