Abstract: The increasing consumption of fossil energy by human beings has caused the content of greenhouse gases in the atmosphere to become higher and higher, which has brought about a significant global warming effect. Chemical absorption method is a widely used low-pressure flue gas carbon dioxide capture technology; however, there are still issues such as high regeneration energy consumption. Based on organic amine absorbents, this article compares the carbon dioxide capture performance of piperazine and its derivatives was compared through small-scale experiments, and develops six types of composite amine absorbents. According to the results of the small-scale absorption regeneration test, formula 2 not only has a high carbon dioxide absorption capacity, but also has excellent regeneration performance, with a saturated absorption capacity of 58.6 L/L and a maximum absorption rate of 0.72 mL/min. In addition, the maximum desorption rate of the absorbent is 5.24 mL/min and the regeneration rate is 52.2 L/L. Based on the results of the small-scale trial, formulas 1, 2, and 6 were selected for dynamic model testing at a scale of 3 m³/h. In the model experiment, under the condition of a carbon dioxide capture rate of 90%, the regeneration energy consumption of the newly developed composite amine was lower than that of monoethanolamine (MEA) absorbent. Among them, formula 2 has the best effect, with a regeneration energy consumption of 58% of MEA absorbent under the condition of gas-liquid ratio of 300∶1. The study systematically studies low-energy absorbents and absorption processes, and the research results have certain guiding significance for engineering applications.