Saline-alkali soil modifier and preparation method thereof

The invention relates to the field of agricultural saline-alkali soil improvers, in particular to a saline-alkali soil improver and a preparation method thereof. The saline-alkali soil improver comprises the following raw materials in parts by mass: 30-50 parts of inorganic metal salt, 20-30 parts of modified desulfurized gypsum, 1-10 parts of amino acid, 1-5 parts of polypeptide, 1-5 parts of a microbial agent, 10-20 parts of modified chitosan and 5-30 parts of an auxiliary agent. The prepared saline-alkali soil improver has a good saline-alkali soil improvement effect and a good crop yield increasing effect, effectively improves the soil structure and increases soil nutrients, can greatly reduce the use of water, has extremely high self-stability, can avoid the strict storage and transportation requirements required by an existing improver, and is suitable for large-scale popularization and application. The service cycle and the service life are prolonged, and the market prospect is very excellent. 本申请涉及农业盐