Scale inhibitor for high-temperature oil refining system as well as preparation method and application of scale inhibitor

The invention provides a scale inhibitor for a high-temperature oil refining system and a preparation method and application thereof.The scale inhibitor comprises a triazole polymer and purine containing hydroxyl, the triazole polymer is obtained through esterification polymerization of 1-acetic acid-4-(1-hydroxycyclopentyl)-1, 2, 3-triazole, the triazole polymer can form a miniature cross-linked network in an oil agent system, and the triazole polymer can form a small cross-linked network in the oil agent system. A capsule is formed with an oxygen-containing compound and is dissolved in oil to prevent oxidation and condensation, so that the deposition of scale is inhibited; the hydroxyl-containing purine can form a protective film layer on the side surface of equipment, so that corrosion to the equipment is reduced or eliminated. When a hydroxyl group in the scale inhibitor is oxidized due to high temperature, carboxyl is formed and can form a chelate with metal ions such as iron and copper, so that the cata