The invention provides a direct-sowing seedling culture method capable of increasing survival rate of leymus chinensis growing in moderate-severe soda saline-alkali soil and relates to a direct-sowing seedling culture method of the leymus chinensis in order to solve the problems of low germination rate, low seed emergence rate and low transplanting survival rate of the leymus chinensis in a conventional leymus chinensis direct-sowing seedling culture technology under the background of moderate-severe saline-alkali soil. The direct-sowing seedling culture method comprises steps as follows: 1, impurity removal and soaking of leymus chinensis seeds; 2, sieving of saline-alkali soil for seedling culture; 3, selection of culturing vessels; 4, filling of the culturing vessels with the saline-alkali soil; 5, trenching on the upper surface of moderate seedling culture soil and addition of isolation media; 6, sowing; 7, management after sowing. According to the direct-sowing seedling culture method, the leymus chinensis seeds can be isolated from the severe saline-alkali soil stress environment in the germination period and the acicular seedling period, a better environment is provided for growth of the leymus chinensis, and the germination rate of the leymus chinensis and the survival rate of the seedlings are increased to the great extent; the germination rate of the leymus chinensis reaches 80% or higher, and the survival rate reaches 90% or higher. The method is suitable for direct-sowing seedling culture of the leymus chinensis.