An analytical method based on QuEChERS with modified multiwalled carbon nanotubes(MWNTs) as adsorbent was developed.The determination of 6 mycotoxins and 3-pesticides-residues,including 2,4-D,methomyl,chlorpyrifos,AFG2,AFG1,AFB2,AFB1,OTA and ZEN in xinhui dried orange peel was carried out by liquid chromatography-tandem mass spectrometry(LC-MS/MS).The factors affecting the extraction，purification and detection efficiency were optimized，and the optimal conditions were as the following：the samples were extracted with acetonitrile-water(80∶20) mixed solution，and purified by QuEChERS method with modified MWNTs as adsorbent.The separation was performed on a Shimadzu C18(150 mm×2.1 mm×3.5 μm) column,then determined by LC-MS/MS under multiple reaction monitoring(MRM) mode and quantified by external standard method with the matrix matched standards solution.Under the optimized conditions,the calibration curves of 9 compounds were linear in the respective concentration ranges with correlation coefficients of 0.983 8-0.998 2.The detection limits(S/N=3) were in the range of 0.18-10 μg/kg.The recoveries at low,medium and high spiked levels ranged from 72.4% to 106%,with relative standard deviations of 2.2%-7.4%.With the advantages of accuracy,high sensitivity，easy operation and rapidness,the method was suitable for the simultaneous determination of mycotoxins and pesticide in xinhui dried orange peel,and was applied in the rapid screening of toxic and harmful substances in foods with satisfactory results.