The invention discloses a method for detecting perchlorate in tea leaves by adopting solid phase extraction-high performance liquid chromatography-tandem mass spectrometry, and belongs to the field of analysis and detection. According to the method disclosed by the invention, by combining acetic acid aqueous extraction and weak anion exchanged solid phase extraction column purification with a high performance liquid chromatography-tandem mass spectrometry detection technology, the contents of the perchlorate in the tea leaves are separated and analyzed; the method has the advantages of high purification degree of matrix, high sensitivity and accurate qualitation and quantitation. According to the method for detecting the perchlorate in the tea leaves, the recycling rate of the perchlorate in the tea leaves is 97.8 to 101.8 percent, the relative standard deviation is less than 10.0 percent, and the minimum quantification limit is 0.01mg/kg; the method can be used for detecting the perchlorate in the tea leaves.