The invention relates to a ventilated leakage-proof diaper, which comprises a diaper body, wherein a flow guide layer is arranged on a diaper liquid suction core body; a surface layer is arranged on the flow guide layer; the two sides of the surface layer are respectively connected with three-dimensional separation edges of the diaper body; a seepage-resistant layer is arranged under the liquid suction core body; the outer surface layer is positioned under the three-dimensional separation edges of the diaper body and the seepage-resistant layer; an anti-seepage layer is laid to the two sides of the lower part of the seepage-resistant layer from the three-dimensional separation edges of the diaper body. The ventilated leakage-proof diaper has the advantages that 1, the SMS blood-resistant water-resistant non-woven fabric is designed on the back side of the ventilated liquid core body layer; the water-resistant goal is achieved; the seepage is effectively prevented; the goal of greatly reducing the thickness of a diaper product is achieved on the premise of achieving the three goals of water resistance, blood resistance and ventilation; 2, through the design of macromolecular composite SMS non-woven fabric layer, the thickness of the great-absorption-quantity diaper is greatly reduced; the absorption quantity of the great-absorption-quantity diaper is ensured and improved, so that the use mark of the diaper cannot be seen from the hip of trousers of a user after the use; the requirements of the user are met.