The invention provides a sectional three-dimensional structure for the fast desalting and soil improvement of
saline-
alkali soil of a new tidal
marsh reclamation area. According to the sectional three-dimensional structure, a soil layer of the
saline-
alkali soil to be desalted is subjected to ditching at the depth of 90-100 cm, and underground pipes are buried in a manner that the burying spacing is 20-30 m and the inclination angle is 1-3 DEG, so as to form an underground-
pipe drainage layer; soil of a sectional
surface layer of the soil layer is grooved at the depth of 40-45 cm and is stacked in an open space aside, and straws are laid uniformly after the surface of soil is leveled, so as to form a
straw isolating layer with the thickness of 5-8 cm; and chopped straws and desulfation
gypsum are added into the soil of the
surface layer, which is stacked aside, the chopped straws, the desulfation
gypsum and the soil of the
surface layer are mixed uniformly, composite soil with the thickness of 10-15 cm is laid on the
straw isolating layer, infiltrating
irrigation capillaries are laid in the spacing of 0.8-2 m, and rest composite soil is then laid and is leveled, so as to form a
straw and
gypsum mixed cultivation layer. The sectional three-dimensional structure has the advantages that the sectional three-dimensional structure is organically combined into a whole up and down, the effects on the fast desalting and soil improvement and effective salinization process inhibition of the new tidal
marsh reclamation area are remarkable, and the improvement cycle for the
saline-
alkali soil of the new reclamation area can be shortened effectively.