With developments in computer graphics and simulation technology, virtual reality (VR), augmented reality (AR) and mixed reality (MR) have been more widely used in several areas of education. To explore and predict hotspots and research trends of VR, AR and MR in education, knowledge mapping is used to provide visualizations of publishing trends, countries, institutions and author co-citations based on Web of Science database in the last ten years. Nine hotspots and trends, including cognitive load, learning environment, knowledge acquisition, training, gamification, assessment, children education, engineering education, and higher medical education, are discovered in the study to show us future research directions in the education field.