The invention discloses a production method for increasing the purity of p-nitrchlorobenzene. The production method comprises the following specific steps: putting anhydrous chlorinated benzene, a sulfuric acid solution and a nitric acid solution into a nitrating pot, adding a nitration positioning agent, and performing a reaction till mass averages of the substances are not changed; settling andfiltering a nitrochlorobenzene mixture after the nitration reaction so as to obtain precipitate; neutralizing the precipitate, and performing water washing; drying the precipitate, so as to obtain p-nitrchlorobenzene of a high purity. By adopting the production method, sodium nitrite is adopted as the positioning agent which has a positioning function in the nitration process, the lower limit of acontrast adjacent ratio is reduced to 1.2, continuous adjustment of the contrast adjacent ratio of 1.2-1.9 is achieved, the contrast adjacent ratio can be adjusted according to market requirements inthe production process, the content of the p-nitrchlorobenzene can be increased to 99% or greater, the yield is up to 98% or greater, the finally obtained product is high in purity, the byproduct obtained in the production process can be also sold, the production cost and the energy consumption can be reduced, the production efficiency can be improved, and toxic and harmful substances can be reduced from sources.