The invention discloses a method of landscaping planting of a coastal dredger fill saline and alkaline land. The method comprises the following steps of 1, carrying out fine soil preparation on the coastal dredger fill saline and alkaline land, ditching, ridging, discharging salt and discharging alkali; 2, utilizing a cave-shaped lining membrane basement tree planting technology on a ridge; 3, managing, wherein the cave-shaped lining membrane basement tree planting technology comprises the steps of (1) digging a forest planting hole according to the size of seedlings; (2) laying plastic films which can be provided with round cracks on the bottom and the lateral surfaces in the hole; (3) arranging an isolating course of 30 cm in the forest planting hole; (4) planting seedlings by adopting a planting method of burying for three times, stamping twice and lifting once; (5) adopting matrix soil suitable for seedling growth as planting soil, and applying 4 kg of biological efficient organic fertilizer to every square meter of matrix soil; (6) covering the earth surface with a layer of film with holes so as to storage water and preserve soil moisture, and ridging and compacting on the film; (7) ridging at the periphery of the forest planting hole to form a round sill. By adopting the method, the survival rate of landscaping planting of the coastal dredger fill saline and alkaline land is effectively improved, and is up to more than 90%. The method has the advantages of simplicity in operation, low cost and easiness in popularization.