Head-mounted display device and perspective display method thereof

The invention discloses a head-mounted display device and a perspective display method thereof. The method comprises the following steps: acquiring an external environment image; carrying out mirror image processing on the acquired external environment image; an auxiliary display screen is additionally arranged on the head-mounted display equipment, and mirrored image information is displayed on the auxiliary display screen; secondary mirroring is carried out on the image displayed by the auxiliary display screen, and the light path direction is changed, so that the image is emitted to a position which can be seen by human eyes deviating from the head-up direction after the human body wears the head-mounted display equipment. The perspective display function is achieved on the head-mounted display device, a user can check the external environment without taking off the head-mounted display device, the use effect that the user watches programs directly and insights the outside by squint is achieved, the head-m