A method was developed for the simultaneous determination of four benzotriazole UV stabilizers（BUVSs） including UV-350,UV-320,UV-328 and UV-327 in textiles by ultra high performance liquid chromatography-tandem mass spectrometry（UPLC-MS/MS） combined with ultrasonic extraction（USE）.The samples were extracted with acetonitrile saturated with n-hexane under ultrasonic assistance.The separation was performed on an Eclipse Plus C18 column（2.1 mm×50 mm,1.8 μm） using 0.01 mol/L ammonium formate-methanol as mobile phase.Identification and quantification were achieved by UPLC-MS/MS coupled with electrospray ionization（ESI） source in positive ion mode and multiple reactions monitoring（MRM） mode,and the concentration of each analyte was calibrated by the external standard method.The result indicated that the calibration curves of four BUVSs showed good linear relationships between peak areas and certain concentration ranges with correlation coefficients（r2） greater than 0.99.The limits of detection for UV-350,UV-320,UV-328,UV-327 were 0.023,0.024,0.006 3,0.021 mg/kg,respectively.The limits of quantitation were 0.078,0.081,0.021,0.072 mg/kg,respectively.The recoveries at three spiked concentration levels were in the range of 80.0%-102.9% with relative standard deviations（RSDs） of 1.2%-9.9%.The developed method was successfully applied in the determination of BUVSs in textiles.