A yarn accumulation device for compact spinning is arranged between a draft roller and a holding roller, which comprises a yarn accumulation aeroscopic plate and a fixation apparatus. The yarn accumulation aeroscopic plate fixed on a fixation apparatus is provided with two yarn accumulation air long guide holes in parallel each other. The yarn accumulation air long guide holes are in parallel with a pumping seam on an accumulation tube, which are also in a symmetrical arrangement on both sides of the pumping seam. Both ends of the lower part of the polymer yarn air long guide hole are provided with a pair of support legs, spanned a conveyor belt, fit tightly and supported on a sliding surface. The invention has the advantages that the yarn accumulation device is disposed between the draftroller and the holding roller, spanned the conveyor belt and flexibly supported on the sliding surface. Through the guide of the air guide hole on the yarn accumulation aeroscopic plate, the air before entering the pumping channel can be in the implementation of directional effective pressing to the strips. The air above the strips is effectively utilized, thus the negative pressure is reduced and the energy is saved.