The utility model relates to the field of bearing parts, in particular to a guide rail beam which comprises a base body, a main guide rail groove and connecting lugs. The main guide rail groove is connected with the base body, and the connecting lugs are connected with the base body. The base body is made of carbon fiber composite materials, and the main guide rail groove is made of metal or alloymaterials. The base body part of the guide rail beam is made of the carbon fiber composite materials, the weight of the guide rail beam can be greatly reduced on the basis that the strength is guaranteed, the main guide rail groove part is made of the metal materials, it can be guaranteed that the main guide rail groove part has good machining performance, and normal work of the guide rail beam is guaranteed.