This paper analyzes the present situation of spatial visual image design in the department of stomatology of children??s hospital, introduces the affective theory into the spatial visual image design, and conducts a questionnaire survey on patients and their families, quantitative and qualitative research on the consultation process, etc. It analyzes the feedback and user needs of the spatial visual image service in the dental department of the existing children??s hospital, and proposes design strategies according to the hierarchical theory of needs and emotionalization. Based on this strategy, the visual cognition and emotional needs of children??s dental consultation process for the visual image design of space from 3 levels, adding interesting factors (color, shape and cartoon stories, etc.) in the visual image design of space can effectively change children??s fear of dental hospital and dental cognition, reduce their fear, make them more cooperative in treatment, and help parents to promote children to form good oral health care This will help parents to promote good oral health care habits and correct understanding of children, thus creating a harmonious treatment environment for doctors and patients.