The invention discloses a back light source framework, a back light source structure and a liquid crystal display device. The back light source framework comprises a framework main body and a plurality of position limiting structures arranged at the outer side of the framework main body, wherein one ends of the position limiting structures are connected with the framework main body in a strippable way, the other ends of the position limiting structures are provided with a position limiting part, and the position limiting surface of the position limiting part shares one surface with the side surface of the framework main body and is positioned at the upper side of the side surface of the framework main body. Through the arrangement of the strippable position limiting structures on the framework main body of the back light source framework, the position limiting structures are used for realizing the position limitation on a display element required to be formed on the framework main body during the assembly, the precise alignment installation can be realized, operation convenience can also be brought to work personnel, through the strippable arrangement of the position limiting structures, the width of the framework main body cannot be increased, and the requirement of narrow side frame design can be met.