The invention discloses a high absorptivity diaper core. The core comprises a lower core, the lower core comprises first wood pulp dust-free paper, first fluffy cotton and first hydrophilic non-woven fabric which are pressed from top to bottom and formed, a first polymer layer is arranged in the first fluffy cotton in a clipped mode, the first polymer layer comprises first polymer water absorbent beads distributed evenly, the upper surface of the first hydrophilic non-woven fabric is provided with an upper core, the surface area of the upper core is 1/7 -2/3 of the surface area of the lower core, an adhesion layer is connected between the first hydrophilic non-woven fabric and the upper core, the upper core is adhered to the lower core, the upper core is smaller than the lower core, and therefore the thickness of the middle area of a diaper is increased, absorption quantity demanded of the middle portion of the core can be ensured, the thickness of the lower core can be reduced at the same time, the periphery of which the usage rate is low is light and thin, the permeability of the core is improved, and the usage amount of row materials of the core is saved, the middle portion of the core is centralized at the same time, and the absorption and utilization rate of the core can be improved.