In carbon dioxide(CO2) capture technology for flue gas, alcoholamine solutions are widely utilized owing to their exceptional absorption capacity and notable economic advantages. However, the composition of flue gas is typically complex, often containing numerous other reactive components, among which oxygen(O2) has a particularly significant impact on alcoholamine solvents. When oxygen(O2) reacts with alcoholamine solutions, oxidative decomposition occurs, resulting in reduced capture efficiency and potentially adverse effects on capture equipment due to degradation products. To address this issue, this paper explores the principle of oxidative decomposition of alcoholamine solutions, analyzes various factors influencing this process, summarizes the substances produced during oxidative decomposition, and investigates the role of antioxidants. Furthermore, this paper also examines the potential applications of antidegradants in alcoholamine solutions and highlights that the development of antidegradants tailored for carbon dioxide(CO2) capture processes represents an important research direction for enhancing the antidegradation performance of alcoholamine solutions.