This high-performance, fully automatic taping machine for adhesive tapes has been designed for taping cardboard boxes of different sizes. The machine receives the filled boxes coming from one or more lines via idler or powered roller beds. The spaced insertion of the boxes, the machine’s regulation to the size of the box inserted, the closing of the upper flaps and the sticking on of the adhesive tape above and below are fully automatic, so an operator does not need to be present.