Greening irrigation system along railway

The utility model belongs to the technical field of rainwater recycling, and particularly relates to a railway line greening irrigation system which comprises an ecological ditch used for preliminarily purifying rainwater around a railway, a filtering device used for re-purifying the preliminarily purified rainwater and an irrigation device used for irrigating greening along the railway. A water collecting pipe is arranged at the bottom of the ecological ditch, the water collecting pipe is communicated with the filtering device, and the filtering device is communicated with the irrigation device. Rainwater around the railway is primarily purified through the ecological ditch, the rainwater subjected to primary purification is purified again through the filtering device, greening along the railway is irrigated through the irrigation device by means of the rainwater subjected to secondary purification, and the problem of greening irrigation along the railway is greatly solved through natural rainwater recycling