The invention discloses an environment-friendly method for drought-resistant afforestation on sandy land, which comprises the following steps: (1) excavating planting pits on sandy land and determining the concentration of the pits according to local rainfall; (2) laying a layer of degradable plastic film at the bottom of each pit, scattering a layer of crop straw on the film, and planting saplings; (3) covering degradable agricultural films after planting, covering sand on the films, and excavating an irrigation hole at the lowest concave position; (4) preparing diammonium phosphate water solution to be filled in an irrigation tank, and leading water to the irrigation hole through a water-leading pipe; and (5) in watering the saplings, inserting the outlet of an irrigation pipe into the irrigation hole, opening a water-control valve to irrigate, and controlling the flow rate at a certain speed.