A monitor visor includes a top component and two side components respectively formed at two sides of the top component, wherein the top and side components are formed in a sheet-like configuration and are orderly connected to form a visor body having a visor cavity with a bottom opening. The sizes of top and side closing walls of the visor cavity match with the sizes of the top and side edges of the monitor respectively. A connecting component is provided between the top component and the side component to join the top component and the side component together. The contour of the inner side of the connecting component matches the shape of the vertex angle of the monitor. The visor is able to match the monitor screen with a circular or another shape of its vertex angle. The visor is easily disassembled, packaged and transported in a convenient manner.