The invention relates to a quantitative detection method for chlorantraniliprole residue in tea leaf. The quantitative detection method is characterized in that the residual chlorantraniliprole in tea leaf is subjected to ultrasonic extraction with an acetonitrile solvent, impurities are removed with a proper amount of MWCNTS and a PSA adsorbent, the supernatant is subjected to nitrogen blowing and concentration to achieve a close drying state, volume metering is performed with an acetone-n-hexane mixed solvent having a volume ration of 1:1, programmed heating separation is performed with a HP-5 chromatographic column, ECD determination is performed with an electron capture detector, and quantitation is performed through a matrix external standard method. According to the present invention, the test results confirm that the method has characteristics of simple, rapid and accurate operation, easy popularizing and grasping and low cost, provides the rapid and reliable method for the determination of the chlorantraniliprole residue in the tea leaf, and can meet the requirements of the large-batch sample analysis on the quality and the progress.