In order to reduce the noise of offshore platform piling, according to the attenuation effect of air curtain on offshore platform piling noise, an air curtain noise reduction model is established by numerical simulation method. By changing the thickness of air curtain layer, air volume fraction, ventilation rate and distance between air curtain and noise source, the influence of the parameter changes on the noise reduction effect is studied. It is found that different parameters are of different influences on the noise reduction effect, and the optimal noise reduction effect and the highest economic benefit should be considered comprehensively when adopting air curtain noise reduction in engineering practice.