The invention provides a monitoring method for nitrogen content of jujube plants planted by using direct seeding and orchard constructing technology. The method comprises the following steps: (1) correlation analysis of different nitrogen contents and jujube canopy spectra; (2) construction of a regression model of the different nitrogen contents and the jujube canopy spectra; and (3) monitoring of the nitrogen content of a jujube plant. The monitoring method is beneficial for improving the utilization rate of nitrogenous fertilizer for a jujube tree, increasing benefits and reducing pollution, can be used for nondestructive monitoring of the nitrogen content of red jujube trees planted by using direct seeding and orchard constructing technology and provides basis for research on scientific and reasonable fertilization schemes.