Novel transition section structure and light and small double-rocker-arm derrick

The utility model relates to a novel transition section structure and a light and small-sized double-rocker-arm derrick, which comprise a transition section structure, the left side and the right side of which are respectively provided with a group of connecting structures; the at least two pulley seat assemblies are detachably and fixedly connected to the connecting structures on the left side and the right side of the transition section structure, and each pulley seat assembly comprises a pulley seat body, a connecting hole located in the pulley seat body and connected with the connecting structure, and pulleys arranged at the left end and the right end of the pulley seat body. The pulley seat assembly is detachably and fixedly connected with the transition section structure through the pin shaft and the cotter pin, the transition section structure is integrally detachable, it is guaranteed that in the derrick jacking process of the transition section structure, self-jacking work can be achieved, dependence