In order to investigate the effects of blending common urea with nano magnesium hydroxide on winter wheat yield and soil nitrate nitrogen content, a field plot experiment is conducted. The experiment included five treatments: conventional fertilization control (CK), common urea (T1), common urea+0.3% (mass fraction, the same below) nano magnesium hydroxide (T2), common urea+0.4% nano magnesium hydroxide (T3), and common urea reduced application of 20%+0.3% nano magnesium hydroxide (T4). The results show that the yield of winter wheat treated with the mixture of common urea and nano magnesium hydroxide is higher than that treated with CK. When the amount of nano magnesium hydroxide added is the same, the yield of winter wheat increases with the increase of common urea application. At the same application rate of common urea, the yield of winter wheat does not increase with the increase of nano magnesium hydroxide addition, indicating that adding 0.3% nano magnesium hydroxide is suitable in this region. There is no significant difference in wheat yield between T4 treatment and T1 treatment, indicating that the mixture of common urea and nano magnesium hydroxide can reduce the amount of nitrogen fertilizer applied. Compared with CK and T1 treatments, the blending of common urea and nano magnesium hydroxide reduced the nitrate nitrogen content in the 0-100 cm soil to varying degrees.