In order to explore the effect of adding desulfurized gypsum on the water movement parameters of saline-alkali soil, and improve and increase the soil productivity in the Yinbei Plain area, through an indoor one-dimensional soil column absorption test, 6 desulfurized gypsum treatments were selected:0, 1.5%, 3%, 4.5%, 6% and 7.5%, to study the horizontal infiltration characteristics and water movement parameters of saline-alkali soil. The results showed that the addition of desulfurized gypsum slowed down the process of soil moisture infiltration. As the proportion of desulfurized gypsum increased, the cumulative infiltration amount and the movement distance of the wet front of each treatment gradually decreased. Power function and Philip model could better fit the water movement characteristics of saline-alkali soil under different desulfurized gypsum addition ratios, and the absorption rate decreased with the increase of the desulfurization gypsum ratios, and the capillary force's water holding effect weakened. As the proportion of desulfurized gypsum increased, the saturated water content of the soil increased and the saturated hydraulic conductivity decreased, the soil water holding capacity was significantly improved. The shape coefficient h_d in the Brooks-Corey model gradually decreased, and the intake suction h_d gradually increased, and soil aeration was enhanced. Under the same moisture content, the soil unsaturated water diffusivity gradually decreased with the increase of the desulfurization gypsum ratios. The addition of desulfurized gypsum increased the soil water holding capacity, changed the soil moisture distribution, and had a significant impact on soil water movement parameters. This study could provide theoretical support for the rational use of desulfurized gypsum to improve saline-alkali land.