The invention provides a method and device for displaying the spatial dimension in the virtual three-dimensional space. The method comprises steps that a request sent by a terminal after detection ofa triggering action for displaying a virtual scene is received; the view field of a virtual human eye viewing the virtual scene is obtained; the spatial dimension of a real room size corresponding tothe home indoor scene is obtained; according to the real room size and a visible portion of the real room size in the view field, whether to display the spatial dimension at the terminal is determined; if yes, a spatial dimension display instruction is sent to the terminal so that the terminal displays the spatial dimension. The method is performed by the device. The method is advantaged in that the spatial dimension can be displayed reasonably as the view angle of an image changes, so the space size of the real room can be more intuitively and clearly represented.