The utility model relates to a beverage straw, in particular to a double-layer beverage straw, aiming at reducing the direct contact of the straw with external environment as far as possible, reducing the pollution of external bacteria to the straw and ensuring the sanitation safety of users. The double-layer beverage straw comprises an inner pipe and an externally-sheathed flexible pipe, wherein the upper end of the inner pipe is provided with a beverage outlet; the externally-sheathed flexible pipe is coaxial with the inner pipe and tightly clung to the outer side of the wall of the inner pipe; the wall of the inner pipe is provided with a fixed adhesion segment which is arranged in the middle of the wall and close to the upper end of the inner pipe; a connection part on the externally-sheathed flexible pipe, corresponding to the fixed adhesion segment, is connected with the fixed adhesion segment to form a middle part; the middle part divides the externally-sheathed flexible pipe into an upper part and a lower part; the upper part and the lower part of the externally-sheathed flexible pipe can be folded and contracted towards the middle part; and when the upper part of the externally-sheathed flexible pipe is folded and contracted towards the middle part, a beverage outlet is exposed.