During the past decades, the dynamics of water and nutrient availability in soils, induced by rising sea levels under global climate change, have been projected to have profound effects on coastal ecosystems. Stoichiometry is the study of the mass balances of multiple chemical elements in ecosystems, mainly carbon (C), nitrogen (N), and phosphorus (P), and it analyzes the constraints and consequences of these mass balances during the ecological interactions. Understanding the stoichiometry of plants would help to assess the nutrient use strategies under the changed soil conditions. Three shrub species, including Tamarix chinensis, Periploca sepium, and Ziziphus jujuba, were selected to study the stoichiometry during the growth season in the Binzhou chenier island and wetland national nature reserve. The three shrubs were dominant species growing in the national nature reserve. The study was conducted from May to October in 2017 and 2018. We established five 10 m×10 m plots parallel to the coastline for each shrub species. At each plot, ten healthy shrubs were selected from each shrub species to collect the leaf samples. We collected 500g leaves from four compass directions and analyzed the foliar C, N, and P.The results showed a negative correlation between the foliar C concetrations and N, P concetrations. The foliar N concetrations showed a significantly positive correlation with P concetrations. The averages of foliar C concetrations were (399.65±2.66) mg/g for T. chinensis, (424.32±1.59) mg/g for P. sepium, and (437.47±1.08) mg/g for Z. jujuba during the growth season. These were lower than those of the national (455.1 mg/g) and global (461.6 mg/g) levels, and showed a lower carbon storage ability of the shrubs under the water-salt stress habitats. The averages of foliar N, P concetrations were (30.14±0.26) mg/g and (1.81±0.03) mg/g for T. chinensis, (23.18±0.38) mg/g and (2.06±0.04) mg/g for P. sepium, (27.36±0.49) mg/g and (2.01±0.03) mg/g for Z.jujuba. The foliar N and P concetrations of the three shrubs were all higher than the national (N:20.2 mg/g, P:1.46 mg/g) and global (N:19.3-20.1 mg/g, P:1.11-1.42 mg/g) levels. The foliar C:N:P ratios were 246:17:1 for T. chinensis, 224:12:1 for P. sepium, and 237:14:1 for Z. jujube, which demonstrated that T. chinensis had higher adaptability to water-salt stress than P. sepium and Z. jujube. The foliar C:N:P ratio was mainly controlled by the foliar P concetrations. The foliar N and P stoichiometry indicated that the growth of T. chinensis was limited by P, P. sepium limited by N, and Z. jujuba limited by both N and P potentially during the growth season, and that niches shift of the three shrubs may partially avoid direct competition for the same resources, thus improving the possibilities of different species coexistence.