A prism sheet, a curved backlight source and a display device are disclosed. The prism sheet includes a substrate and a plurality of prism units arranged on the substrate in an array. Each of the prism units has a triangular cross-section which has a first base angle and a second base angle, and both the first base angle and the second base angle are at a side of the cross-section close to the substrate. The degrees of the first and second base angles of the triangular cross-section of at least one of the plurality of prism units are different from each other. By means of the prism sheet, the backlight source and the display device according to the embodiments of the present invention, the uniformity of brightness of the emitted light may be improved, the visual angle may be increased, and as a result, the visual effect may be improved.