Aiming at the current situation that gaseous organic solvents are difficult to recover due to the existence of trace amount of nitroglycerin（NG）（0.02-4.83 mg·kg^-1） during the production of tri-base gun propellant, the absorption-degradation method is adopted to absorb and chemically decompose NG via spray liquid. Results show that sodium hydroxide aqueous solution, sodium hydroxide ethanol aqueous solution and sodium sulfide aqueous solution can be used as spray liquid and the explosion-elimination performance is positively correlated with temperature and solution concentration. Taking the initial concentration of gaseous NG, 5 mg·kg^-1, as an example, the removal rate of gaseous NG reaches 99.92% when the concentration of sodium hydroxide aqueous solution is 2.0%, the system temperature is 50 ℃, the gas-liquid contact time is 20 s and the ratio of the liquid to gas is 0.16 L·m^-3.