The present invention relates to saline alkali land corn base fertilizer, and specifically to a saline alkali resistance corn base fertilizer and a preparation method thereof. The corn base fertilizer comprises, by weight, 150-250 parts of an organic matter, 100-200 parts of calcium sulfate, 5-10 parts of urea, 100-200 parts of compound fertilizer, 2-5 parts of an active cover agent, 20-40 parts of a porous inorganic substance, 150-250 parts of an acidic liquid, and 0.1-0.5 parts of a compost fermentation agent, wherein the compound fertilizer mainly comprises N, P, K and Zn, the weight ratio of the N to the P to the K to the Zn is 1:0.80-1.10:1.20-1.60:0.40-0.70, and the use amount of a N fertilizer slow-release agent (dicyandiamide) is 2.0-3.0% of the use amount of the N fertilizer. According to the present invention, the special corn fertilizer has an effect of regulation of the pH value of the soil; the considerable organic material, the porous inorganic material, and the like are added, such that the effects of soil structure improving, soil organic matter improving, and soil fertility improving are provided; the utilization efficiency of the N in the compound fertilizer can be improved by matching the corn base fertilizer with the N fertilizer slow-release agent.