Graphics card display method and system in UEFI mode and related components thereof

The invention discloses a graphics card display method, a graphics card display system and a graphics card display device in a UEFI mode, and a readable storage medium. The graphics card display method comprises the steps of: judging whether a graphics card priority in BIOS setting options is an external graphics card being preferred; if so, detecting whether the external graphics card is insertedinto an external card slot or not; when the external graphics card is inserted into the external card slot, determining that the external graphics card is a target graphics card, and enabling an onboard graphics card to be in a closed state; when no external graphics card exists in the external card slot, determining that the onboard graphics card is a target graphics card, and enabling the onboard graphics card to be in an open state; and if not, determining that the onboard graphics card is the target graphics card, and enabling the onboard graphics card to be in an open state. The graphicscard display method deter