Abstract: A portable water purifying bottle comprises: an upper cover, having a water output port; a filter core component, disposed inside the upper cover, and located below the water output port; and a plastic cup sleeve, sleeved into a lower portion of the upper cover. The portable water purifying bottle is simple in design, the plastic cup sleeve made of silicone for storing water is retractable for easy carrying, thus fulfilling the needs of outdoor user. Further, the portable water purifying bottle is able to provide water output at fast speed to save time, while its appearance is compact and pleasing, hereby having a good prospect in the market.