The invention discloses a 2-chloropyridine synthetic method, which belongs to the technical field of fine chemical engineering. The method comprises the following steps: adding pyridine into a hypochloric acid salt solution, uniformly mixing the solution, slowly adding hydrochloric acid drop by drop at room temperature, stirring a mixture and reacting the mixture for 1-2 hours; then heating the material to the temperature of 60-80 DEG C, continuously reacting the material for 1-2 hours; and finally, adding a certain amount of a NaOH solution and neutralizing the solution to a pH value of 9-11, extracting a reactant by using trichloromethane and separating the reactant; distilling an extract phase and removing a trichloromethane solvent in order, recovering the unreacted pyridine to obtain the chloropyridine product. According to the invention, a GC/MS analysis on the chloropyridine product is carried out, selectivity of 2-chloropyridine can reach 83%. The hydrochloric acid and hypochlorite by-product with low cost in industrial production can substitute a chlorinating agent such as Cl2, reaction condition is mild, selectivity is good, process is simple, cost is low, and environment and safety problems during the production process of 2-chloropyridine can be solved.