PURPOSE: A portable water purification device is provided to effectively improve water by adsorbing and separating foreign materials in water, and to maximize the dissolved oxygen amount by producing bubbles in the water. CONSTITUTION: A portable water purification device includes the following: a water tank(10) in which an inlet(11) is formed and a water pump(21) is located; a pressure tank(23) filled with water transferred through an inlet pipe(22) by the water pump; a vertical air injection pipe(31) transferring the air; a branch tank(32) connected to the air injection pipe; and a bubble generating part selectively generating the bubbles through a nozzle on an end of a discharge pipe(24).
