The invention provides a three-dimensional vegetable planting device capable of achieving automatic irrigation and facilitating fertilization and relates to the technical fields of agriculture, automatic irrigation, three-dimensional planting and soilless culture. The device is mainly characterized in that the automatic irrigation and three-dimensional cultivation function is achieved, and space can be fully used. According to the technical scheme, the device is characterized in that the device is composed of a hook, a rotary shaft, a detachable screw, a hanging rope, a water basin, a water absorbing rope, a planting rope, a water absorbing rope for seedling breeding, towels for seedling breeding, a convex-face towel ring, a concave-face towel ring, an inner ring, an outer ring, a concave cover and a water storage tank. A sponge above the planting rope, the towels for seedling breeding and the concave cover can be used for planting seedlings after being wetted, the planting rope is arranged on the inner ring and the outer ring, the towels for seedling breeding are stacked and distributed in an up-down mode, and the automatic irrigation function is achieved because a solar power generation plate supplies power.