Chlorocyanogen iodohydrin is a strong oxidative phosphorylation uncoupling agent, which can inhibit the phosphorylation process of insect mitochondria, so as to prevent the synthesis of triphosphate gland test in insect body, resulting in the rapid weakening of the activity of insect energy metabolism and finally death. It has good curative effect on a variety of flukes, nematodes and arthropod larvae.