The utility model discloses a form traveler for a guide wall of an underground continuous wall, which is applicable to concrete construction of the guide wall of the underground continuous wall. A formwork system comprises formworks and formwork supports, a form system and a support system are used for supporting an integral formwork and bearing concrete lateral pressure. A traveling system comprises traveling wheels and a winch and is used for integrally moving a form. An operating system adopting hydraulic operation or mechanical operation is used for adjusting the positions of the formworks and stretching the formworks. The formworks are designed into small steel dies to be applicable to height-adjustable guide wall construction requirements, and the small formworks are fixed onto the formwork supports to be high in integral strength and straightness. When the form traveler is used for construction, the formworks do not need to be repeatedly mounted and demounted and transported again and again, and the lateral pressure of concrete is fully borne by the supporting system without adding grounding screw rods. Therefore, the form traveler has the advantages of high applicability, fine construction quality, low labor intensity, high production efficiency, convenience in operation, low use cost and the like.