Abstract: A straw closing sleeve for closing a drinking end of a straw includes a foldable blank that is converted into a sleeve body. The sleeve body includes a top end wall, two surrounding wall halves that extend downwardly from a peripheral end of the top end wall and that cooperate to define a bottom opening opposite to the top end wall, and a receiving space between the top end wall and the bottom opening, and two adhesively bonded joint portions that are respectively connected to two opposite sides of each of the surrounding wall halves. A foldable blank supplying sheet and a roll of foldable blank supplying tape for providing the straw closing sleeve are also disclosed.