Disclosed are a binocular see-through AR head-mounted device and an information displaying method thereof. Sight mapping relationship η is preset in the head-mounted device, human eye spatial sight information data of a user is tracked and calculated by a sight tracking system, virtual information that needs to be displayed is displayed on the left and right lines of sight of the human eyes on the basis of a binocular see-through AR head-mounted device virtual image imaging principle and a human eye binocular vision principle, thus implementing accurate overlap of the virtual information to the proximity of the position of the fixation point of the human eyes, allowing a high degree of integration of the virtual information with the environment, and implementing enhanced virtual reality in the true sense. The present invention provides a simple solution, requires only the sight tracking system to complete the process, obviates the need for excessive hardware facilities, and is inexpensive.