The utility model discloses a scalable head for silicone adhesive plastic barrel, including cavity inner core, outer sleeve and set up the intermediate layer spring in the outer sleeve, the inside ofintermediate layer spring is placed in to the cavity inner core, and the outside of intermediate layer spring is placed in to the outer sleeve, and the cavity inner core is including inner core body,the play jiao kou who sets up in inner core body one end and be used for being connected and following with the intermediate layer spring inner core body a week and the lug of setting on inner core body outer wall are provided with on the inner wall of outer sleeve along the first inner wall of outer sleeve inner wall circumference range is protruding and the second inner wall is protruding, haveformed the flexible space of intermediate layer spring between first inner wall arch and the second inner wall arch. The utility model discloses a scalable head for silicone adhesive plastic barrel, reasonable in design, simple manufacture, use cost is low, and it has been solved well to beat and colloid problem intermittent and not tight phenomenon can appear when meetting the lap -joint when gluing, has improved joint -sealing's quality and speed.