Abstract: Aimed at the problem of SO2 pollution how impact on vegetation, this article from the macro and micro two aspects of SO2 pollution multi-scale impact on vegetation were discussed. Micro aspects mainly displays in vegetation changed within the normal physiological functions, such as stomatal opening and closing speed change, the activity of the enzyme destroyed, cytoplasm membrane permeability changed as the concentration of SO2 and the time different, photosynthesis strength; Macro aspects disturbs the normal growth and development of vegetation, the phenomenon such as the plants dwarf, leaf size, pollination rate and yield decreased, thus making plant biomass decreased; Due to the sensitivity of the different plants of SO2 pollution is different, make the structure change of the vegetation community.