The advances of Augmented Reality (AR) technology make the solving of many difficulties become possible. Decades of development in the Augmented Reality field have shown that this emerging technology has the ability to bring about sweeping improvement in numerous areas, especially in education where the AR technology could see its most meaningful fulfillment in one's development. In this paper, we present a comprehensive survey of AR technologies and applications in education domain. In the end of this paper, we summarize several future directions that the educational AR technology would be heading to. We aim to provide instructors and learners, who are using or plan to use AR as a tool in their educational practice, a useful insight into the state-of-the-art AR developments and applications.