The present invention relates to a kind of buffy coat extracts kits, it include: that there is box body cylindrical plasma part to form an internal volume plasma layer, cylindrical buffy coat part extends in the longitudinal direction, the plasma part for the diameter for having diameter small with the lower member of plasma simultaneously simultaneously forms buffy coat layer internal capacity, it is extendd in the longitudinal direction with cylindrical red cell fraction, there is with lower part buffy coat part diameter to be greater than buffy coat and red blood cell layer formation internal volume simultaneously, wherein the part blood plasma of free end and free end and red blood cell component are respectively to open Red cell fraction is movably contained in the filler of lower part keeps air-tight state With the mobile lower package of pusher.
