The invention discloses a saline-alkali soil conditioner, and belongs to the field of soil improvement. The soil conditioner has good biocompatibility with high-pressure fat extraction, pulverizationand fermentation of pig bones, and bacterial cellulose has many hydroxyl groups which can chemically react with dopamine, carbomer and the like in the system to further improve the water retaining effect; NaHCO3 and Al2(SO4)3 added hierarchically can be stirred and geothermally treated during the use, wherein the aluminum hydroxide is an amphoteric metal hydroxide and can react with alkaline components in the saline-alkali soil to produce aluminum salts, so as to achieve the effect of reducing the alkalinity of soil; and the culture material for culturing locust improves the vitality of the stomach, has certain inducing effect on plant growth, and can promote plant growth and improve soil fertility. The saline-alkali soil conditioner solves the problems of poor water retaining property andpoor improvement effect of the conventional saline-alkali soil conditioner.