The utility model relates to a suction straw. The utility model is characterized in that the lower part of a suction straw is provided with an air chamber, and the inner part of the suction straw can also be provided with an inner straw which can be moved in a telescopic method. The novel suction straw can float automatically to a beverage bottle opening, and the suction straw can not fall into a bottle when the suction is paused. The inner straw can be stretched and regulated to the needed length for some beverage bottles with high bottle body. The novel suction straw has unusual structural characteristic and convenient and practical performance, and can bring a fire-new consumption feeling.