A method and device for tweaking a virtual reality image. The method comprises: acquiring first three-dimensional coordinates and a first posture angle of a positioning component (101); converting the first three-dimensional coordinates into second three-dimensional coordinates and converting the first posture angle into a second posture angle (102); converting the second three-dimensional coordinates into target three-dimensional coordinates in a virtual space and converting the second posture angle into a target posture angle in the virtual space (103); determining a projection plane in the virtual space (104); perspectively projecting a virtual object in the virtual space onto an imaging area in the projection plane to produce a two-dimensional image (105); and displaying the two-dimensional image on a display screen of a display module (106). The method and device allow the projection plane to be determined on the basis of the position and posture angle of a virtual reality (VR) device in the physical space and the two-dimensional image to be produced, thus implementing tweaking, on the basis of changes in the position and changes in the posture angle of the VR device in the physical world, of the virtual reality image provided by the VR device.