The invention relates to a method for the industrial preparation of 6-methyl-3-amino pyridazine. The method comprises the following steps of: subjecting common and easily available 6-methyl-pyridazine triketone hydrobromic acid salt serving as a raw material to chlorination reaction with added phosphorus oxychloride and ammonification reaction with added ammonia water; and recrystallizing and purifying the product of the ammonification reaction with ethanol to obtain the 6-methyl-3-amino pyridazine. The method solves the problems of high amplifying danger, light weight and low content of the product, low equipment requirement and the like of the prior art, and realizes mass industrial production.