The advent of “Big Data” has brought a new round of challenges to the professional development of preschool teachers in China. At the same time, it has also put forward new requirements for the professional development of preschool teachers. Based on the perspective of big data, this paper proposes the path of professional development of preschool teachers in the context of big data by analyzing the confusion faced by the professional development of preschool teachers in the context of big data. The first is to change the traditional concept and reshape the role of preschool teachers. The second is to transform the teaching thinking and change the teaching methods of preschool teachers. The third is to update the development model so that the professional development model of preschool teachers can keep pace with the times. The ultimate goal is to enable preschool teachers to better improve their professional development skills.