The utility model relates to a ash-tank inner liner structure, comprising: a biliary body and a bile cover, wherein the biliary body is provided with an accommodating space, a cover groove is arranged on the top of the biliary body, and an enlarged groove portion is arranged on the inner edge wall of the accommodating space The biliary cover covers the top of the biliary body to close the accommodating space of the biliary body； thereby, the biliary body can increase the volume without changing the appearance volume.本創作一種骨灰罈內膽結構，包含：一膽體及一膽蓋，該膽體內設有一容置空間，該膽體頂部設一蓋合槽，該容置空間內緣壁設置一擴大槽部，該膽蓋蓋合於該膽體頂部，封閉該膽體之容置空間；藉此，使得該膽體可在不變更外觀體積的情形下增大容積。
