The invention relates to the field of chemistry, in particular to a sulfur-resistant high-temperature-resistant corrosion inhibitor and a preparation method of the sulfur-resistant high-temperature-resistant corrosion inhibitor. The sulfur-resistant high-temperature-resistant corrosion inhibitor comprises, by weight, 15-30 parts of an imidazoline compound, 1.5-2 parts of benzothiazole derivative,0.15-0.5 part of a basic catalyst and 25-35 parts of a solvent. The basic catalyst is alkaline hydroxide, and the solvent is a mixture of alcohols and benzene or homolog of alcohols and benzene. Aftertesting, the sulfur-resistant high-temperature-resistant corrosion inhibitor has good corrosion inhibition performance and continuous corrosion inhibition efficiency at a high temperature of 180 DEGC.