As the main participants in the teaching of science curriculum, the professionalism of elementary school science teachers is very important to the teaching work of teachers, the scientific literacy of students as well as the reform and development of science education. Therefore, the professional literacy of elementary school science teachers in Changsha County was thoroughly researched and analyzed from three aspects: professional affective literacy, professional knowledge literacy and professional ability literacy. Through the questionnaire survey and interviews, it was found that some science teachers have the problems of lack of professional affective literacy, single knowledge structure and low professional ability literacy. These problems are mainly attributed to the teachers’ weak sense of professional development, the limitations of curriculum teaching and implementation ability, the schools’ insufficient attention to the science curriculum, and the insufficient investment in education funding. To address these problems, this paper proposes optimization paths such as clarifying development goals, strengthening practice reflection, deepening the learning and application of the new curriculum standards, raising the importance of science curriculum teaching, and increasing the investment in science education. Through these measures, we aim to enhance the professionalism of elementary school science teachers, improve the quality of teaching, cultivate students’ scientific literacy, and promote the sustainable development of science education.