In recent years, there are many studies on kindergarten environmental education. However, most of them focused on kindergarten programs, while studies of kindergarten teachers' pedagogical competence indicators in environmental education have not been established. This study aims to (1) explore the content of pedagogical competence for teachers in sustainable environmental education and (2) construct pedagogical competence indicators for these teachers. The research data were collected through focus group interviews, card sorting and four rounds of a Delphi questionnaire, and then analyzed by qualitative and quantitative methods. According to the research, the pedagogical competence indicators in environmental education cover three aspects: teacher quality, curriculum development and use of resources. There are four dimensions of teacher quality: personal quality, teaching ability, teaching expertise, and professional growth. Curriculum development includes curriculum scope and curriculum implementation. As for use of resources, it contains on-campus and off-campus resources. There are 42 indicators in total, among which include 39 primary indicators and 3 secondary indicators. The indicator system can be a reference for kindergarten teachers and educational administrators in Taiwan.