An Air-splicing device for splice-connecting two glass-fiber roving strands (1, 3), comprises a strand channel (6) open at its two opposing ends (7, 8), two splice chambers (9, 10) arranged side-by-side in said strand channel, at least three strand clamps (13, 14, 15, 16) two of which are outer strand clamps (13, 15) arranged at either side outside of said two splice chambers and at least one of which is an inner strand clamp (14, 16) arranged between said two splice chambers, and two strand cutters (17, 18) arranged at the opposite ends of the strand channel. Said first and second splice chambers are feedable with pressurised air independently of each other.