A mobile drip irrigation system that includes a supply pipe connected at one end to a liquid source and extending therefrom. At least one tower supports the supply pipe above the ground, and includes drive means for moving the tower and supply pipe in a desired direction. A plurality of ports are positioned along the supply pipe. The system includes a plurality of vertically oriented drop line assemblies. Each drop line assembly has an upper end connected to one of the plurality of ports, and a lower end spaced above the ground. A horizontal liquid distribution system is fluidly connected to the plurality of drop line assemblies to allow a horizontally uniformly spaced drip of the liquid at a desired distance from the ground.