Corrosion inhibitor for composite oil-gas field

A corrosion inhibitor for an oil-gas field and the preparation method therefor. The composition of the corrosion inhibitor by mass is: 5%-20% tall acid dicyclohexyl amid, 10%-30% triphenylamine oleic acid salt, 1%-3% nonionic surfactant, 10% -15% hexamethylene glycol, 5%-10% propargyl alcohol, 1%-3% citric acid and balance of water. The preparation method is that citric acid is dissolved in water, then hexamethylene glycol, propargyl alcohol and nonionic surfactant are added into the water, after stir is performed completely, tall acid dicyclohexyl amid and triphenylamine oleic acid salt are added, and the obtained mixture is stirred uniformly.