The invention relates to the technical field of genetic engineering, particularly to a ziziphus jujuba SOD (superoxide dismutase) gene and application thereof. A nucleotide sequence of the ziziphus jujuba SOD gene is indicated in the SEQ ID (sequence identifier) NO (number):1, and an encoded amino acid sequence of the nucleotide sequence is indicated in the SEQ ID:2. The ziziphus jujuba SOD gene and the application thereof have the advantages that the ziziphus jujuba SOD gene is segregated from a ziziphus jujuba tree for the first time, a plant expression vector is constructed, a transgenic arabidopsis plant is obtained, transferring the ziziphus jujuba SOD gene as a target gene into the transgenic arabidopsis plant is practically significant to plant breed improvement, in-depth study of a mechanism of resistance of a high-resistance plant is benefited, molecular structures, expressions, functions and regulations of stress-related genes are defined beneficially, certain experimental data are provided and theoretical bases are established to further improve stress resistance of the plants by means of fully making use of high-resistance genes, understanding of functions of SOD in ROS (reactive oxygen species) signal transaction of the plants is facilitated, and people are helped to understand reactive oxygen serving as signal molecules.