The invention discloses a method for planting corn in saline-alkaline soil, comprising the steps of deeply turning over, irrigating for washing, making ditches, covering with organic base fertilizer and inorganic base fertilizer, shallowly turning cover, making drain ditches, sowing corn, irrigating for washing once a month in the growth stage of corn, and applying a nutrient solution after each irrigation for washing until the corn is mature, wherein the organic base fertilizer is made by mixing biogas slurry, crop stalks, methyl cellulose and soap powder at a mass ratio of (300-500):(1000-2000):(0.5-1):(0.5-1), and the nutrient solution is made by mixing biogas slurry and crop stalks at a mass ratio of (1000-2000):(300-500), fermenting at 30-35 DEG C for 10-15 days, and filtering to obtain filtrate. By increasing the amount of organic fertilizer to be applied herein, the amount of the inorganic fertilizer to be applied is decreased; suitable soil improving measures are taken, less salt is accumulated during corn planting, and yield of corn per mu is increased. In addition, both the organic fertilizer and nutrient solution used herein are prepared mainly from stalks, returning stalks to field is achieved, and utilization rate of stalks can be increased.