Abstract: The three dimensions of cultivating students through sport competitions in the new era is the basic category and theoretical system of cognitive dimension, value dimension and practice dimension formed by school sports, which answers the questions of what sport competition is, why and how to do it. At the category of cognitive dimension, student sport competitions act as an important support for "promoting the all-round development with sport competitions", a key carrier for "shaping culture through competitions", and a major means for "cultivating talents by competitions". At the category of value dimension, student sport competitions have the general value of realizing the healthy growth of students through integrated sports experience, supporting the cultivation of innovative talents through progressive game thinking spectrum, and the special value of implementing the integration strategy of sports and education in the form of inclusive sports education, cultivating the Chinese sportsmanship in the form of diversified physical activities. At the category of practical dimension, the development of student sport competitions is firstly to strengthen the systematic concepts and promotes the innovation of competitions; secondly, to improve the institutional mechanism and realize the integration of competitions; and lastly, to enhance the supply methods and expand the number of participants.