The invention discloses a lapping machine, which comprises an upper frame, a lower frame, a first conveying curtain, a second conveying curtain, a third conveying curtain and a telescopic mechanism. The telescopic mechanism is arranged between the upper frame and the third conveying curtain, and by adjustment of the telescopic mechanism, the other end of the third conveying curtain gets close to or away from the first conveying curtain. A first flat curtain and a second flat curtain are transversely arranged on the upper frame, a triangular supporting plate is arranged under the first flat curtain and the second flat curtain, and a first output bottom curtain is arranged under the triangular supporting plate. The lapping machine has a function of outputting multi-layer webs and single-layer webs, 90-degree turning of the single-layer webs can be realized through the triangular supporting plate to enable uniform orientation with an output direction of the multi-layer webs, and accordingly production requirements of single-layer web and multi-layer web products can be met by one carding machine, and equipment input cost is saved.