The invention discloses a rapid construction method for salt-tolerant economical vegetation in muddy coastal severe saline-alkali land based on discharging salts by underground pipes. The method comprises the following steps: flattening a land block, and arranging a work way every 40m; longitudinally spreading an underground pipe in the middle of each 40m land, and horizontally spreading underground pipes at a distance of 10m to communicate with the longitudinal underground pipes; spreading 5cm stone at the upper layer of the underground pipes, and spreading a non-woven fabric layer at the upper layer of the stone; applying corn stalks and other materials per mu, and performing mixing; and adopting a planting mode of a combination of ridge cultivation and drip irrigation, and open ditchesformed by ridging communicate with longitudinal open ditches located at the edges of the work ways and are used for surface layer water discharge and salt discharge. The method disclosed by the invention adopts the combination of the underground pipes and the open ditches to enhance the salt discharge, the combination of deep plowing and the stalks to enhance salt leaching, and the combination ofthe salt-tolerant plants and salt-reducing quality-improving materials to improve the survival rate, so that the soil viscosity is reduced, the soil salinity is reduced, and the soil quality is improved, thereby making the coastal alkali-salinity barren land can become an oasis harvesting park in a current year.