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In order to explore the effects of nitrogen fertilizer solution on soil infiltration characteristics and water and nitrogen migration patterns before and after magnetization, a 300mT constant magnetic field intensity was used to magnetize different potassium nitrate solution concentrations (0g/L, 0.4g/L, 0.7g/L and 1.1g/L), un-magnetized treatments were used as control, and electrical conductivity, pH value, dissolved oxygen amount, cumulative infiltration amount, and wetting front migration distance of solution under different treatments and water and nitrogen migration distribution in different soil profiles after infiltration were determined. The results showed that the amount of dissolved oxygen was significantly increased and electrical conductivity and surface tension were significantly reduced by magnetized fertilizer solution, and the change degree became more significant with the increase of fertilizer solution concentration. The cumulative infiltration amount and the wetting front migration distance within the same time were increased by magnetized fertilizer solution. Soil sorptivity rate S, soil saturated hydraulic conductivity Ks, and effective soil water diffusivity D- in the Philip, Green-Ampt, and one-dimensional algebramic infiltration models were increased, while the suction Sf at the wetting peak and the soil moisture characteristic curve and comprehensive shape coefficient of unsaturated water conductivity m were reduced. The effect of increased infiltration was increased with the increase of nitrogen fertilizer solution concentration. The magnetized nitrogen fertilizer solution improved soil water holding capacity and it was increased with the increase of solution concentration. The one-dimensional algebraic infiltration formula could well describe the distribution of soil water content at the end of soil infiltration of each fertilizer solution concentration under different magnetic field intensities. Both the nitrogen fertilizer solution concentration and magnetization had significant positive correlations with soil nitrate content, and magnetized fertilizer solution with high concentration had the highest values under the combined effect which benefited the conservation of soil inorganic nitrogen.