Over the years, social and emotional competence has received much attention as a key competence for the social development of individuals. The level of social and emotional competence has gradually become an important indicator for assessing students' personal social adaptability and well-being in life. Based on the global report of Social and Emotional Competence Measurement released by OECD in 2021, understanding parents and a good parent-child relationship will promote the development of social and emotional competence of primary and secondary school students to a certain extent. Under the educational background of home-school-society co-education, family education has become an important part of education. Research shows that a harmonious family atmosphere is more conducive to the healthy development of children's physical and mental health. Moreover, lower elementary school students are in the transition period and have the psychological characteristics of preschool children, such as insecurity, judgment, emotional instability, etc., which require more attention and guidance from parents, teachers, and society. This study analyzes relevant literature to investigate the influence of the parent-child relationship on the social and emotional competence of lower elementary school students and develops parent-child activities for the five major competencies of social and emotional competence.