The performance of ammonia-based CO2 absorption under static magnetic field conditions was discussed. The removal efficiency of CO2, CO2 load, and absorption capacities were studied using a bubble reactor system. The CO2 removal efficiencies, CO2 load, and absorption capacity under static magnetic field conditions were calculated at four kinds of different operating conditions, which included CO2 concentration in flue gas, gas flow rate, concentrations of aqueous ammonia, and reaction temperature. The results indicated that the initial removal efficiency of CO2 can reach 98.5% by 10wt% ammonia solution under static magnetic field conditions, and it is 7% higher than that under the no magnetic field conditions. The effect of magnetic field on CO2 load and absorption capacity is more obvious when the inlet CO2 concentration in the simulated flue gas is 10vol%, the CO2 load increases 11.7% from 1.45mol/L to 1.62mol/L, and the absorption capacity rises from 0.668kgCO(2)/kgNH(3) to 0.738kgCO(2)/kgNH(3). Compared with the absorption of CO2 under static magnetic field conditions and no magnetic field conditions, the absorption process of CO2 is enhanced by the magnetic field, and the removal efficiency of CO2, CO2 load and absorption capacity show superior performance.