Synthetic method of stable isotope deuterium-labeled DDT

The invention relates to a synthetic method of stable isotope deuterium-labeled DDT. The synthetic method comprises the following steps: with stable isotope deuterium-labeled chlorobenzene as an isotope-labeled precursor, in the presence of a catalyst, carrying out dehydration synthesis on the isotope-labeled precursor and chloral to obtain the stable isotope deuterium-labeled DDT. Compared with the prior art, according to the synthetic method disclosed by the invention, after the stable isotope deuterium-labeled DDT is separated and purified, the isotope-labeled position is stable, so that the abundance of an isotope is prevented from diluting, the chemical purity achieves above 99.0 percent, the abundance of the isotope achieves above 99.0 percent atom, and the stable isotope deuterium-labeled DDT can fully meet the needs for residue detection in the food safety field.