A production method of the co-production of paraquat by the glyphosate is provided, which belongs to the technology field of the pesticide chemicals. the tail gas of the glyphosate hydrolysis and that of the dimethyl phosphate production are collected by pressing and fully react under the temperature of 30 DEG C. to 110 DEG C. and the pressure of 0.1MPa to 0.7MPa by adding the pyridine methanol solution; the sodium hydroxide and the sodium cyanide are then added to carry out coupling reaction to gain the 1, 1' -dimethyl-4-4' -bipyridine coupling compound; after heating, precipitating and filtering, the filter liquor carries out oxidation reaction by adding the chlorine to gain 1, 1' -dimethyl-4-4' -bipyridine dichloride crude products; the conventional promoter is added and prepared to the corresponding paraquat technical concentrates or aqua. The invention adopts the glyphosate and the methyl chloride of the dimethyl phosphate tail gas to synthesize and prepare the paraquat and fully and comprehensively utilizes the byproducts with simple and easy production process. In addition, the invention lowers the purification and separation cost of the byproduction methyl chloride, and does not need bulking and transporting for co-production with safety and high efficiency, thereby further reducing the production cost and has remarkable economic benefits.