This high-performance, fully automatic taping machine for gummed paper 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 gummed paper above and below are fully automatic, so an operator does not need to be present.