The utility model belongs to the technical field of plastic blood bag, concretely is a kind of plastic blood bag of inverted
centrifugation, including blood bag body, the top of blood bag body is successively equipped with hose and butterfly type interface from left to right, the middle part of blood bag body outer side wall is provided with adjusting mechanism, adjusting mechanism includes the first
extrusion plate of blood bag body front end surface and the second
extrusion plate of blood bag body rear end surface, the left and right ends of first
extrusion plate front end surface are all provided with through hole, the inside rotation of through hole is connected with clamping plate, the upper and lower two end surfaces of clamping plate are all equipped with multiple limit plates of symmetrical distribution, improve the centrifugal effect to blood when blood bag body is inverted and centrifuged, so that the blood distribution in blood bag body is more uniform.