The invention discloses corrosion-resistant stable soldering flux. Raw materials of the corrosion-resistant stable soldering flux comprise, by weight, 25-35 parts of modified rosin, 10-15 parts of phytic acid, 3-8 parts of lactic acid, 2-5 parts of citric acid, 2-4 parts of itaconic acid, 1-2 parts of triethylamine, 10-15 parts of polyethylene glycol, 1-2 parts of rosin amine, 0.5-1 part of O-diazonaphthoquinone-5-sulfonyl rosin amine, 0.8-1.2 parts of aniline hydrochloride, 0.5-1.5 parts of octaphenyl polyoxyethyiene, 0.8-1.5 parts of sodium dodecyl sulfonate, 0.2-0.5 part of aluminum chloride, 0.5-1 part of catechol and 200-300 parts of a solvent. The corrosion-resistant stable soldering flux has good welding aiding activity, and effectively prevents oxygen and the like from entering themetal surface, and therefore the corrosion resistant performance and the stability of the soldering flux are improved.