The invention relates to cigarette manufacture mechanical equipment, in particular to a flavoring machine of a filter rod forming machine. The flavoring machine of the filter rod forming machine comprises a flavoring cylinder and a flavoring machine box which are arranged on a panel of the filter rod forming machine, wherein one side of the flavoring machine box is provided with an essence storing and supplying device; a cotton thread chamber is also arranged in the flavoring machine box; and a cotton thread spreading device is arranged above the cotton thread chamber. The flavoring machine also comprises a cotton thread power device arranged on the panel of the filter rod forming machine. The flavoring machine of the filter rod forming machine can be adapted to threads with different specifications and can regulate the positions of cotton threads in a filter rod, prevent the problems of cigarette burst, thread exposure, and the like and strengthen the adaptive capacity on different materials of the flavoring machine.