The invention relates to a cylindrical hybrid structure group tower auxiliary arm and a jacking device as well as a construction method thereof. The jacking device is on the top surface of a basic tower, mast sections are overlaid continuously on the top surface of the basic tower to form a tower jacking section; at least one auxiliary arm rod is arranged, one end of the auxiliary arm rod is connected with the tower body through lock nuts, the other end of the auxiliary arm rod is connected with the steel column of a cylindrical hybrid structure through a column-embracing member; the column-embracing member consists of channel steel, wall-penetrating bolts and a connection plate; two pieces of channel steel stick to the side of the steel column and are pulled and integrated together through the wall-penetrating bolts; and the side close to the auxiliary arm rod, of the channel steel is connected with the connection plate, and the connection plate is provided with connecting holes connected with the auxiliary arm rod. By reasonably setting the tower crane and the auxiliary arm jacking device, the construction speed can be greatly increased, the suspension of the structural construction caused by the reason that the tower crane can not jack the auxiliary arm rod can be avoided, technical support and guarantee can be provided to ensure the structural construction progress, the construction efficiency can be increased, and the construction progress can be accelerated. The construction method in the invention can be widely used in the installation of the cylindrical hybrid structure.