[Objective] The conditions and factors influencing soil water repellency (SWR) of Heilu soil was explored in order to provide a reference for research on the response of local rainfall infiltration behavior to water repellency under the background of climate change. [Methods] The experiment was conducted on farmland from Changwu County on the Loess Plateau. Measurements were made on soil samples from the 0—20 cm soil layer of a maize field and an alfalfa field. Soil samples from the two crop fields were brought to a laboratory and tested at four soil moisture contents, three bulk densities, and three levels of added octadecylamine (OCT). Water repellency tests were conducted by measuring drip penetration time. [Results] SWR increased with increasing soil moisture content (ranging from 0% to 6%), bulk density, and OCT addition. Soil moisture content, OCT addition, and soil bulk density exhibited multi-factor interaction effects on SWR. Stepwise regression analysis determined that the best model occurred with OCT and water content as regression parameters. Under a soil bulk density of 1.3 g/cm³ at 0% moisture content with 0.15% OCT addition, 2% moisture content and 0.10% OCT addition, the non-water-repellent Heilu soil would turn into slightly water-repellent soil. [Conclusion] More attention should be given to the impact of soil water content and accumulation of polar substances on water repellency risk under different land uses during the process of precipitation infiltration for a Heilu soil under low-water conditions.