The invention discloses a method for improving 
saline-
alkali soil by utilizing beneficial microbial 
bacteria. The method comprises the following steps: domesticating the beneficial microbial 
bacteria and inoculating into a mixture of biocarbon, 
peat moss, maize cobs and coco 
coir; scattering the mixture of the biocarbon, the 
peat moss, the maize cobs and the coco 
coir into soil needing to be improved; then enabling the soil to be subjected to deep ploughing to reach the depth of 20 to 30cm and evenly mixing, then watering the soil to ensure that the 
moisture content of the soil is not less than 30 percent, and finally covering a fresh-keeping film for 10 to 15 days; uncovering the fresh-keeping film every two days, watering the soil of 100 to 200kg / mu and then ploughing the soil again; finally covering the fresh-keeping film again. According to the method disclosed by the invention, the beneficial microbial 
bacteria are inoculated into the mixture of the biocarbon, the 
peat moss, the maize cobs and the coco 
coir after being domesticated, and the mixture of the biocarbon, the peat moss, the maize cobs and the coco coir is used as an dependent matrix of the beneficial microbial bacteria, so that the activity of the microbial bacteria can be effectively improved, and the quantity of bacterial 
flora of the beneficial microbial bacteria is increased; moreover, the mixture is scattered into the 
saline-
alkali soil needing to be improved again, so that the activity of the 
saline-
alkali soil can be effectively improved.