The invention belongs to the field of devices for blood component separation, and relates to a centrifugal bag type blood component separator. The centrifugal bag type blood component separator comprises a double-layer flow path integration device, the double-layer flow path integration device communicates with an anticoagulant bag, a saline bag, a whole blood bag, a erythrocyte bag, a plasma bag, a blood platelet bag and a centrifugal bag; the double-layer flow path integration device comprises an upper cover plate, a middle integrated body and a lower cover plate, wherein the middle integrated body comprises an outer shell; the inner part of the outer shell is partitioned into an upper layer and a lower layer by a middle partition plate; an anti-coagulant pipe, a blood collection tube, a blood return tube, a centrifugal tube, a plasma tube, an erythrocyte tube, a PRP tube, a blood platelet tube, a whole blood vessel and a mixing tube are distributed on the upper layer and the lower layer; and the outer periphery of the outer shell is provided with a plurality of connectors distributed in two layers, and the connectors communicate with corresponding pipelines arranged in the upper layer and the lower layer. According to the centrifugal bag type blood component separator, the structure is simple, only one double-layer flow path integration device is needed, the number of electromagnets needing to be used in cooperation with the whole device is small, the safety is high, the damage rate is low, and the service life is long.