The invention relates to the technical field of paper product processing, in particular to a roller folding machine. The roller folding machine comprises a placing device, a feeding device arranged on one side of the placing device, a humidifying device, an indentation device, a gluing device and folding devices, wherein the humidifying device, the indentation device, the gluing device and the folding devices are arranged according to the paper folding processing sequence. The humidifying device is used for wetting and softening paper. The indentation device is used for pressing out folding marks on the softened paper. The gluing device is used for gluing the paper with the folding marks. The paper folding devices are used for folding the glued paper and outputting the paper. Each folding device comprises a folding drive mechanism and a folding roller connected to the folding drive mechanism. By the adoption of the folding machine, feeding, humidifying, indentation, gluing and folding of the paper are achieved automatically, the folding working efficiency and the folding accuracy are improved, the production cost is lowered, and the folding quality is guaranteed.