High pH, Na+, and (CO32-+HCO3-) are the primary characteristics of soda saline-alkali soil. Current strategies for ameliorating soda saline-alkali soil often involve the combined use of cow manure and maize straw, the addition of biochar (BC), and the inoculation of (BS). In this study, -loaded biochar (BSC) was prepared using an adsorption technique. An incubation experiment was conducted. The treatments were as follows: soda saline-alkali soil amended with maize straw and cow manure (T), which was used as a control; T supplemented with earthworms (T); and T supplemented with BS (T), BC (T), or BSC (T). After a 60-day incubation, T showed the most significant reduction in pH, ESP, and (HCO3- + CO32-) concentrations, with reductions of 0.24 units, 3.26%, and 120 mg kg, respectively, compared to the T treatment. The content of soil humic acid, available potassium, and available nitrogen and the activities of β-glucosidase and urease were highest in T, increasing by 33.5%, 70.1%, 26.1%, 19.0%, and 17.9%, respectively. Microbial sequencing analysis revealed that the abundance in T was highest during the first 45 days (2.51-3.65%), while the abundance in T peaked at 3.22% after the 60-day incubation. The soil that was cultivated for 60 days in the experiments was then used for planting alfalfa. T showed the highest alfalfa aboveground biomass and peroxidase, increasing by 30.1% and 73.1%, respectively, compared with T. This study demonstrated that loading onto biochar is beneficial for the survival of in soda saline-alkali soil. When traditional organic materials are used, the combination of earthworms and . -loaded biochar significantly alleviates the constraints of soda saline-alkali soil.