The utility model discloses a tower machine tower section transition device with horizontal support, including transition section and four group's horizontal support spares, wherein the transition section by four stands, four group's upper junction plates, four groups down connecting plate, four horizon bars, eight group link brackets form, horizontal support spare comprises bracing piece, bracing piece, banding pole, two sets of anti side hydro -cylinder, two sets of assembly pulley hydro -cylinder, two sets of end connection board. 600 high~800mm of transition section, but direct mount in tower machine base section and tower standard internode of machine or the standard internode of two arbitrary towers machine, four group's horizontal support spares connect gradually in the transition section four sides. The utility model discloses can effectively solve quick -witted problem and the difficulty of changing to the in -process existence that jacking die carrier support system is fixed of fixing from the ground basis of tower to whole the conversion process safety, convenient, body of the tower bottom horizontal support structure safe and reliable can follow the whole upper segment of constructing and economize the time limit for a project.