A bite valve manufactured from a soft and flexible material includes a joining section, a liquid outlet section, and at least a pair of columns at an inner wall approaching the liquid outlet section to retain the bite valve and to prevent an inner channel of the bite valve from being closed, and an extension tube projecting from an outer periphery of the liquid outlet section and being capable of bending backward to accommodate around the outer periphery of the liquid outlet section. Wherein, the joining section is for joining with a liquid guide tube of a liquid container.