The purpose of this study was to analyze the level of competencies to support play and the implementation of the 2019 revised Nuri curriculum of early childhood teachers, as well as the relationship between them. Apropos this,, a questionnaire was completed by 262 teachers teaching 3-5-year-old children at public and private kindergartens as well as public, workplace, and private daycare centers in Seoul, Chungcheong, and Gyeonggi provinces. As a result of this study, early childhood teachers recognized the level of their competencies to support play. Additionally, implementation of the 2019 revised Nuri curriculum was found to be high. Moreover, the level of public kindergarten teachers competencies to support play and implementation of the 2019 revised Nuri curriculum were significantly higher than those of private kindergarten teachers. Further there was a significant difference in the implementation of the 2019 revised Nuri curriculum according to the experience of teachers. Teachers with more than five years of experience had significantly higher competencies to support play than teachers with less than five years of experience. The influence of competencies to support play, of early childhood teachers, on the implementation of the 2019 revised Nuri curriculum was found to be high at 67%. Among the competencies to support play, the competencies to manage play was the most important factor in the implementation of the 2019 revised Nuri curriculum, followed by competencies to observe and analyze play, and competencies to respond to play and communicate. In order to promote the competencies to support play that affect the implementation of the 2019 revised Nuri curriculum, it is necessary for early childhood teachers to make personal efforts to enhance their expertise through the learning community, with specific support from the government or early childhood education institutions.