The professional competence of preschool teachers is an important measurement scale for the professional development level of preschool teachers and an important representation of a high-level preschool teacher team. The TTK learning community gives new implications to the cultivation of the professional competence of preschool teachers, such as creating a three-pronged model, constructing an ecosystem of diverse symbiosis, and creating a collaborative education mechanism for the cultivation of preschool teachers’ professional competence. The professional competence of preschool teachers consists of multiple interactive professional knowledge, multidimensional professional ability, and multivariate co-education of professional passion in the view of TTK learning community. TTK learning community can promote the development of preschool teachers’ professional competence through building a knowledge sharing place for “dialogue and cooperation,” a professional upgrading organization for “multi-dimensional interaction,” and a competence internalization environment for “integration of learning and practice.”