The invention provides a vehicle-mounted eye tracking device based on reality technology enhancing. The vehicle-mounted eye tracking device based on reality technology enhancing comprises an image colleting device, a human-car interaction display device, an eye tracking module and a control module. The control module comprises a controller, a data processor and a data storing device. The eye tracking module comprises a light source assembly and an imagine sensor. The eye tracking module tracks a target stared by eyes of a car driver and captures eye characteristics. The controller generates corresponding control orders according to the eye characteristics. The image collecting device collects car outer images and extracts image characteristics according to the control orders. The image characteristics form data information after the image characteristics are processed by the data processor. The data information is matched with stored data in the data storing device. The controller enables visualization program corresponding to the successfully-matched stored data to be displayed in the human-car interaction display device. By means of the vehicle-mounted eye tracking device based on reality technology enhancing, the car driver can be assisted in real-time knowing information data of interested targets within a view range.