The invention discloses a sulfonyl pyridine derivative and a synthetic method thereof. Substituted aminoacrolein, emulsifiers and substituent cyanoethyl sulfone are added into a reactor and are subjected to reaction at a certain temperature; the reaction is tracked until the substituted aminoacrolein or the substituent cyanoethyl sulfone is disappeared; then halogen hydride is added into reaction liquid to continuously carry out reaction, and the detection is tracked until the reaction is completely carried out; alkali liquid is added into the reaction liquid to regulate the pH value to 7-8, and standing and layering treatment is carried out to obtain a water layer and an organic layer; the water layer is extracted by using an organic solvent, then the organic layer is combined, and refining is carried out to obtain the sulfonyl pyridine derivative. The problems that the synthetic reaction time of the conventional sulfonyl pyridine derivative is long and more three-wastes are produced so as to be difficultly treated are solved, and the effects that the reaction yield is so high to reach 82% or above, even being up to 93.5%, and the operation process is simple, the sulfonyl pyridine derivative is green and environment-friendly, fewer three wastes are produced, and the sulfonyl pyridine derivative is suitable for industrial production are achieved.