[Objective] This study aimed to compare and analyze the effect of three types of microalgae fertilizers and their varying application rates on salinized soil improvement. The impact on physiological indexes and maize yield was assessed, offering a novel reference for the enhancement of salinized soil. [Methods] This study conducted a field experiment in the saline-alkali of Tumochuan Plain. Three types of microalgae fertilizer (designated as W1, W2, and W3) were formulated for the experiment., Each microalgae fertilizer was established with three levels of application (15 L/hm2, 30 L/hm2, 45 L/hm2, designated as N1, N2, N3), alongside a control group with no algal fertilizer, resulting in a total of 10 treatments., [Results] The findings indicated that, regarding soil physical and chemical parameters, the application of microalgae fertilizer considerably decreased soil bulk density by 4.11% to 12.34% compared to the control treatment. The soil porosity rose by 10.82% to 38.31%. The soil pH value and salt concentration fell by 1.82% to 9.90% and 17.12% to 47.66%, respectively. Regarding maize growth, in comparison to the control treatment, the plant height, stem diameter, and leaf area index of maize subjected to microalgae fertilizer treatment exhibited increases ranging from 1.12% to 18.47%, 1.15% to 29.02%, and 22.50% to 74.14%, respectively. The 100-grain weight and yield improved by 16.02% to 48.31% and 15.73% to 41.31%, respectively. The yield of maize had a substantial negative correlation with soil bulk density and pH value, while demonstrating a significant positive correlation with leaf area index. [Conclusion] The thorough assessment of the membership function indicated that the application of No.2 microalgae fertilizer at 30 L/hm2 (W2N2 treatment) yielded the highest overall score in enhancing saline-alkali land and augmenting maize production. The judicious use of microalgae fertilizer can enhance soil salinity management and augment crop yield in agricultural production, which is a better way to apply fertilizer for comprehensive improvement and utilization of saline and alkaline land.