The invention discloses a nutrient capable of improving the saline and alkaline resistance ability of a plant. The nutrient comprises the following raw materials in parts by weight: 5-10 parts of water-retaining agents, 0.02-0.04 parts of indolebutyric acid, 0.01-0.03 parts of gibberellin, 0.03-0.05 parts of polyaspartate, 20-30 parts of fully-decomposed crop straws, 30-40 parts of fully-decomposed kraal manure or pigsty manure, 0.06-0.15 parts of yeast, 1-10 parts of quick lime, 10-15 parts of ferrous sulfate, 0.6-3 parts of copper sulfate, 3-6 parts of manganese sulfate and 0.8-3 parts of monopotassium phosphate. The nutrient has the beneficial effect that the water-retaining agent, the indolebutyric acid, the gibberellin, the crop straws and an efficient compound fertilizer are fully mixed, so that the moisture utilization rate and the production efficiency are improved, the requirements of saline and alkaline resistance, high hygroscopicity and durability of the plant are satisfied, and the water-retaining effect of the nutrient is greatly improved.