A one-piece drink-through cup lid with a straw section used for covering on beverage cups, said drink-through cup lid comprising: a cup lid having a peripheral surface and a peripheral edge extending from an outer edge of said peripheral surface; a conic section is formed and protruding axially at a center of the peripheral surface and has a bottom periphery connecting to the peripheral surface so as to form a first through hole inside the conic section, and a rim is formed by the conic section extending outwardly from the bottom periphery; a detachable tube section extending axially from an inner periphery of said rim and having a closed surface at a top of said detachable tube section and a tear line surrounding a bottom edge of said detachable tube section for detachment; whereby the detachable tube section and the conic section are formed in one-piece to form a closed structure of the drink-through cup lid and when the detachable tube section is torn along the tear line and detached from the conic section, a second through hole is formed at the top of the conic section said second through hole connecting through the first through hole to form a conic straw section on the cup lid for drinking through; wherein the tear line is a broken line; the conic section is shaped in a curve gradually extending wider from the rim to the peripheral surface of the cup lid; the diameter of bottom periphery of the conic section is 25-50% long of a diameter of the cup lid; a diameter of the rim of the conic section is 15-25% long of the diameter of the cup lid; a height from the bottom periphery to the rim is 25-40% long of the diameter of the cup lid; a diameter of the detachable tube section is 8-16% long of the diameter of the cup lid; and a height from the rim to the closed surface of the detachable tube section is 10-20% long of the diameter of the cup lid; and the detachable tube section is in a conic shape. a cup lid having a peripheral surface and a peripheral edge extending from an outer edge of said peripheral surface; a conic section is formed and protruding axially at a center of the peripheral surface and has a bottom periphery connecting to the peripheral surface so as to form a first through hole inside the conic section, and a rim is formed by the conic section extending outwardly from the bottom periphery; a detachable tube section extending axially from an inner periphery of said rim and having a closed surface at a top of said detachable tube section and a tear line surrounding a bottom edge of said detachable tube section for detachment; whereby the detachable tube section and the conic section are formed in one-piece to form a closed structure of the drink-through cup lid and when the detachable tube section is torn along the tear line and detached from the conic section, a second through hole is formed at the top of the conic section said second through hole connecting through the first through hole to form a conic straw section on the cup lid for drinking through; wherein the tear line is a broken line; the conic section is shaped in a curve gradually extending wider from the rim to the peripheral surface of the cup lid; the diameter of bottom periphery of the conic section is 25-50% long of a diameter of the cup lid; a diameter of the rim of the conic section is 15-25% long of the diameter of the cup lid; a height from the bottom periphery to the rim is 25-40% long of the diameter of the cup lid; a diameter of the detachable tube section is 8-16% long of the diameter of the cup lid; and a height from the rim to the closed surface of the detachable tube section is 10-20% long of the diameter of the cup lid; and the detachable tube section is in a conic shape.