The invention discloses a dual-channel non-woven fabric three edge bag folding device. The device comprises a wallboard (1), a slope type clamping conveying mechanism (2) and side edge inward foldingmechanisms (3), wherein the wallboard and the side edge of the slope type clamping conveying mechanism are provided with bottom inward folding mechanisms (4), and bottom inward folding plates (41) ofthe bottom inward folding mechanisms are in an up-down adjacent state with side edge inward folding plates (31) of the side edge inward folding mechanisms. The number of the side edge inward folding mechanisms is two, and namely one is on the left side and the other is on the right side; and correspondingly, the number of the bottom inward folding mechanisms is two, and namely one is on the left side and the other is on the right side. According to the folding device, clamp conveying, flattening processing, two side edge inward folding and bottom inward folding can be carried out on non-woventhree-dimensional bags, so that three-dimensional bag folding processing for the non-woven three-dimensional bags can be realized, and therefore the folding device is small in occupied areas, convenient in multi-piece overlapping packing and high in working efficiency; and in addition, when unfolded, the three-dimensional bags are more attractive in appearance, thus improving the quality of the non-woven three-dimensional bags.