The invention discloses a special corrosion and scale inhibitor for TRT, which is mainly used for the corrosion prevention of blast furnace gas excess-pressure turbine rotor blades. The special corrosion and scale inhibitor for TRT contains organic heterocyclic compounds, efficient corrosion inhibitor, surfactant, scale inhibition dispersant and water, wherein the weight percentages of the components are: 15 to 25 percent of organic heterocyclic compounds, 20 to 45 percent of efficient corrosion inhibitor, 2 to 5 percent of surfactant, 10 to 35 percent of scale inhibition dispersant and the balance being water. After the corrosion and scale inhibitor is added to a blast furnace gas pipeline, the corrosion and scale inhibitor can be heated and vaporized into gas by the temperature of gas so as to enter a TRT turbine device along the gas pipeline. Under the condition of continuous addition, the corrosion and scale inhibitor can prevent the generation of TRT blade salt deposit and attach a smooth protective film to the surface of a blade, so as to separate the blade from the outside, thereby playing a role in protecting the blade and prolonging the life span of equipment.