Automatic water stopper for snorkel

The present invention relates to an automatic water stopper for snorkel, and more particularly to a structurally strengthened automatic water stopper for connecting to a snorkel to provided good water-stopping function automatically. An automatic water stopper for snorkel mainly includes from bottom to top a lower case having radially equally spaced upright air tubes, a float and a water-stopping diaphragm having corresponding radiated cross section, an air path disk, and an upper case. The air path disk includes a plurality of alternately arranged valve openings and air paths. The air paths are aligned with and therefore always communicable with the air tubes for air to flow into and out of the snorkel while the valve openings are closed or opened depending on positions of the float in the lower case. When the valve openings are opened, air flows into or out of the snorkel along a path defined by the valve openings, the air paths, and the air tubes. When the float contacts with water and moves upward to close the valve openings, external water is prevented from flowing into the snorkel.