The present disclosure provides a screen-shooting method and device for a guest operating system in a computer apparatus. The computer apparatus has a host operating system, and a guest operating system is displayed through a display window on the host operating system and assigned to the guest operating system. The method comprises: receiving a screen-shooting request from the guest operating system; looking up a layer corresponding to the display window on the host operating system and assigned to the guest operating system; and transmitting the layer to the guest operating system as the displayed guest operating system screenshot. Embodiments of the present disclosure make the screen-shooting for the guest operating system faster in an environment in which a plurality of operating systems are running simultaneously.