The invention relates to the field of display technology, and particularly to a surface light source, a backlight module and a display device. The surface light source of the invention comprises at least one optical fiber and at least one light source, wherein the at least one light source is provided at one end of the at least one optical fiber one to one, the at least one optical fiber each is provided with a plurality of light outgoing windows along its length direction, a light beam emitted from each light source propagates in a corresponding optical fiber, and outgoes from the optical fiber through the plurality of light outgoing windows. The surface light source and the backlight module adopting the surface light source have advantages of wide gamut, high efficiency and high light focusing effect. The display device adopting the backlight module has better display effect.