A web butt-joining system having a feeding section with rolls for feeding a pair of new and old webs, a cutting and joining section having cutting drums and joining drums, and a drive control section. The latter is composed of a driving DC motor commonly coupled to the cutting drums and joining drums. A calculation control circuit drives the DC motor and drive control section is operated to cut said new and old webs fed from said feeding section and piled one on another with said cutting drums and to butt-join the ends of said webs thus cut with bonding tapes provided on said joining drums.
