Non-woven cloth production line and yarn feeding and spreading device thereof

The yarn feeding and spreading device comprises a yarn spreading support, a yarn spreading roller and a plurality of friction rollers are sequentially mounted on the yarn spreading support from left to right, the yarn spreading roller is rotatably mounted on the yarn spreading support, the friction rollers are mounted on the yarn spreading support in a liftable manner, and the friction rollers are mounted on the yarn spreading support in a rotatable manner. The yarn spreading roller and the friction rollers are arranged in parallel, a plurality of axially-extending ridges are arranged on the peripheral face of the yarn spreading roller in a protruding mode, the ridges are arranged around the axis of the yarn spreading roller, and a groove is formed between every two adjacent ridges. By means of the arrangement, when the edges of the yarn spreading roller rub against fiber bundles, the fiber bundles can be provided with high-voltage static electricity, after the edges are separated from the portions, provided