The utility model relates to a respirator for swimmer, composed of an air intake duct and an air duct. The air intake duct and the air duct are fixed on one floater. The air duct is fixed on the floater. The other end of the air duct is communicated with a suction hood. A sucker is arranged in the suction hood. When use the respirator, one can bite the sucker with teeth so that the suction hood can be made to contact closely with face. By using this respirator, people can dive and carry out swimming activities, freely breathe under water and concentrate to carry out physical and extremities thrash exercises. The respirator is especially adapted to the beginner. The respirator has advantages of easy usage and free breath.