The invention relates to a device and method for making walking diaper pants for adults and infants. The device comprises a welding device, a cutting knife box and a shaped cutter box assembly, wherein a traction conveying wind catcher and a conveying wind catcher are sequentially arranged between the welding device and the cutting knife box, a conveying wind catcher and a pre-shaped-cutting conveying wind catcher are sequentially arranged between the cutting knife box and the shaped cuter box assembly, a post-shaped-cutting conveying wind catcher is arranged at the outlet of the shaped cuter box assembly, a main transmission line is formed from the welding device to the post-shaped-cutting conveying wind catcher and provided with distribution application lines at the upper part and the lower part, either distribution application line comprises an automatic changing-over device, a non-woven fabric automatic unrolling assembly, a tension swing rod assembly, a material traction driving wheel correction device and a sizing assembly, and cloth is conveyed to the traction conveying wind catcher through a transition wheel. The invention has the advantages that both walking diaper pants for adults and infants and other conventional diaper pant products can be produced.