The invention relates to a Gemini type bimolecular Sciff base waste water corrosion inhibitor. The corrosion inhibitor is characterized by comprising the following components by weight percent: 10-20 percent of Sciff base, 6-9 percent of benzotriazol, 2-5 percent of thioglycollic acid, 1-3 percent of surface active agent and 63-81 percent of solvent. A method for preparing the Gemini type bimolecular Sciff base waste water corrosion inhibitor comprises the following steps: (1) a bimolecular Sciff base compound 1,5-bi(hydroxybenzhydrazide)-pentane is synthesized from the raw materials of salicylyl hydrazine and glutaric dialdehyde; and (2) the bimolecular Sciff base compound 1,5-bi(hydroxybenzhydrazide)-pentane prepared in the step (1) is compounded to obtain the corrosion inhibitor according to the weight percent: 10-20 percent of Sciff base compounds and 80-90 percent of compounds. The corrosion inhibitor can restrain the corrosion of waste water media, and guarantees the safe operation of water injection pipelines during production.