Characteristics of plant ecological stoichiometry homeostasis are the result of long-term adaptation to the environment and are related to their ecological adaptation strategies. Nitrogen (N) and phosphorus (P) stoichiometric homoeostasis in different organs of shrubs and grasses in the degraded vegetation communities were studied to provide scientific basis for adaptation strategies of plants in the process of vegetation community degradation in the karst area of northwestern Guangxi. Based on the investigation and sampling of five degraded vegetation communities in the karst area of northwestern Guangxi, the N and P contents of shrubs (leaves, stems, and roots) and herbs (aboveground and underground parts) in different degraded communities were determined. The stoichiometric characteristics, interrelationships between different organs, correlations with soil physicochemical properties, and homoeostasis characteristics were analyzed. The P contents in different organs of shrubs showed a trend: leaf>stem>root, while the N content and N: P showed a trend: leaf>root>stem. The P, N content and N: P of herbs all showed a trend: aboveground>underground parts. With the intensified degradation of the vegetation community, the N and P contents of various organs of shrubs and underground parts of herbs, the N: P content of shrub roots showed a decreasing trend; the N and P contents in aboveground parts of herbs showed a decreasing trend in the first four degradation stages, and increased in the fifth stage; the N: P content of underground parts of herbs showed a trend of increase firstly and then significantly increased. While there was no significant change in N ∶ P in other organs. N ∶ P of plant leaves was less than 14 in shrubs and herbs. N and P showed significantly positive correlation in all organs; There were positive correlation between the same nutrient element and element ratio among different organs, as well as between shrubs and herbs. N, P and N: P in different organs of shrubs and herbs were significantly positively correlated with soil N, P and N: P. P content in various organs of shrubs and herbs were significantly negatively correlated with soil C: P. The H_N、H_p and H_{N ∶ P} of various organs in shrubs showed a trend: leaf>stem>root. The H_N of aboveground parts of herbs was greater than that of the underground part, while the H_p and H_{N ∶ P} were opposite. The homoeostasis of different elements in the same organ of shrubs and herbs showed H_N>H_p>H_{N ∶ P}. The growth of shrubs and herbs in karst area was mainly limited by N, and N element had the highest homeostasis. The responses of different organs of shrubs and herbs to changes in N and P content during vegetation community degradation were homogeneity and cooperativity.