Provided is a rapid detection method for residual trithion in fruits and vegetables. A fruit and vegetable sample is placed into a container, an extracting agent and a water storing agent are added, and ultrasonic extraction is performed so as to obtain an extracting solution. The extracting solution is placed into a container with a cover; anhydrous magnesium sulphate, graphitized carbon and bonded silica gel PSA are added, and standing is performed after oscillation is performed. A supernate is placed into another container with a cover, a low-polarity organic solvent is added, and standing is performed for the second time after oscillation is performed for the second time. 0.5-4 ml is taken therefrom and placed into a test tube, blow-drying with nitrogen is performed, an eluent is then added, and oscillation is performed for the third time. The eluent is taken therefrom and placed into a detection cell, a metal sol and an inorganic salt flocculating agent are then added and mixed until uniform, and detection is performed inside a detection room of a Raman spectrometer. The operation is easy and convenient, and the detection can be achieved without professionals. The detection time is short, and the rapid screening of large quantities of samples can be achieved. The accuracy is high, and no false positive phenomenon occurs. Large amounts of an organic solvent and a toxic reagent are not required, and thus no harm is caused to the physical health of detection personnel and the environment.
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