The invention relates to a device and a method for continuously feeding slivers of a wool physical thinning device. The device comprises over two sliver trays, two horizontal long rollers, over two vertical guide rollers, a pair of drawing vertical guide rollers and a pair of front feeding rollers. The method adopts over two slivers to be fed from both sides of the device continuously; the slivers take the form of wool balls and are drawn out from the inside of the wool balls; the feeding direction and the overall sliver advance direction are angulated at 90 DEG approximately; the slivers arerotated and advanced through the horizontal long rollers, and small twist degree is obtained; the slivers are guided to pass through the front drawing vertical guide rollers through the vertical guide rollers; after combination, the slivers abutted against each other enter into the front feeding rollers when the tension is the same. The device and the method have the advantages that: the slivers are drawn out from the inside of the wool balls and naturally obtain small twist degree during the feeding process; joints of various slivers are staggered, thereby no weak link is easy to generate; aplurality of slivers are close to one another, thereby improving the overall cohesive force and the overall uniformity of the slivers and being favorable for continuous feeding and improvement of theoutput and the quality of the slivers after stretching.