The invention discloses an arbor planting method in coastal sandy land. The method comprises the following steps: digging planting holes, laying bottom geotechnical cloth, putting soil under seedlings and planting the seedlings, filling soil, pouring root fixing water, covering a top geotechnical cloth, digging a primary domestication circular groove, configuring primary domestication soil, digging a secondary domestication circular groove, and configuring secondary domestication soil. The method can effectively improve survival rate of planting arbors in coastal sandy land, and can ensure the arbors to gradually adapt to grow on the coastal sandy land after the arbors survive. According to characteristics of excessive solution saline and alkaline of sand caused by very low water-retention rate of sandy soil in the coastal sandy land, through reducing moisture loss amount and moisture evaporation capacity of loess in the planting holes, the planting soil (loess) in the planting holes of seedlings can maintain required moisture all the time. The method effectively solves a problem of dead seedlings caused by excessive solution saline and alkaline, and through domestication, the seedlings are finally suitable to survive on the coastal sandy land.