A grating, a manufacturing method thereof and a display device are disclosed. The grating comprises: a substrate including a plurality of first view field regions (A1) and a plurality of second view field regions (A2) which are alternately distributed; a plurality of ridge structures formed on the substrate in each first view field region (A1) and each second view field region (A2); and a patterned light shield layer being formed on the ridge structures and including a plurality of light-blocking regions and a plurality of light-transmitting regions, wherein in each first view field region (A1), each light-transmitting region is formed on a sloping surface of a first side of each ridge structure; in each second view field region (A2), each light-transmitting region is formed on a sloping surface of a second side of each ridge structure; and the first side and the second side are two opposite sides.