The utility model belongs to electrically assisting device field, in particular to buckle formula secondary cable elbow, the wide application is in the construction is laid to electric power system secondary cable open air. The elbow is inside hollow L type tubular structure, is provided with buckle device in the outside of L type tubular structure, L type tubular structure include half body on the L type, with the arched part of half body lock on the L type, the both ends of half body on the L type are semi -circular, and the lateral wall incurves along the semicircular profile, arched part 's one end is semi -circular, circular arc that the other end is less than 90 degrees for the radian, and arched part 's lateral wall incurves along the profile semi -circular and circular arc, buckle device is including being located spring bolt on half body on the L type, being located the lock core on the arched part. The utility model provides an operation alone can be accomplished, simple structure, simple to operate in the on -the -spot saving engineering time that can be obvious of operation to equipment.