The invention provides a method for synthesizing chloronitropyridine methyleneimidazolidine through a one-pot process. The synthetic method adopted in the invention is characterized in that the structural formula is as shown in the specification, chloronitropyridine methyleneimidazolidine is synthesized by virtue of the one-pot process, the intermediate of the reaction in each step does not need to be separated and purified, the operations of all synthesis units are finished in the same reaction kettle, the equipment utilization rate is high, the after-treatment process is simple and convenient, the operation conditions are mild, and the three wastes are greatly reduced. The product is recrystallized by virtue of an organic solvent, the content of the product is 98 percent, and the method has good industrial production prospects.