An augmented reality device, an augmented reality system and an information prompt method thereof. The augmented reality device includes a micro display, an augmented reality element and an optical waveguide element. The micro display is configured to emit light carrying display content, the light includes a first light portion in a first polarization state and a second light portion in a second polarization state; the augmented reality element is configured to allow the first portion to convert from the first polarization state into the second polarization state, to allow the second light portion to convert from the second polarization state into the first polarization state, and to couple the first light portion in the second polarization state and the second light portion in the first polarization state to the optical waveguide element; the first polarization state is perpendicular to the second polarization state.