The harmonious development of infant's physical and mental health is the educational goal of the kindergarten stage, which specifically means that the individual's physical, psychological and social adaptation are in a sound state, not only the absence of disease or weakness. The healthy development of psychology, as a necessary part of the all-round and healthy development of infant's body and mind, affects the overall development of individuals. As a kindergarten, it is obligated to carry out corresponding mental health education to pay attention to and promote the development of infant's mental health. However, infant's mental health is facing various challenges and needs to be paid attention to and solved urgently. As the two major systems that affect infant's psychological development, the starting point and research question of this study is how to carry out effective mental health education in kindergartens and families, so as to enable infant's psychological healthy development. Therefore, this paper first introduces the concepts of mental health and mental health education, which provides a theoretical basis for this study. Secondly, from the perspective of developmental psychology, this paper analyzes the value of family kindergarten cooperation in infant mental health education. Finally, this paper proposes strategies for better cooperation between families and kindergartens in mental health education, which can provide reference for improving the quality of infant's mental health education and promoting the development of infant's physical and mental health.