The present invention relates to a portable two-stage ultraviolet sterilizer comprising: a hand-grip casing having a built-in dry battery for supplying power therein and provided with an operation switch circuit-connected to the dry battery a first ultraviolet sterilization unit having a cylindrically shaped external housing integratedly formed at the front end of the hand-grip casing, and provided with a plurality of first ultraviolet LEDs, so as to be exposed, at the circumferential surface of the external housing at sequentially fixed intervals such that the plurality of first ultraviolet LEDs are controlled to be turned on/off by being circuit-connected to the operation switch and a second ultraviolet sterilization unit having a cylindrically shaped internal housing provided so as to protrude at a fixed length outwardly to the opened front of the external housing in a state of being accommodated inside the external housing of the first ultraviolet sterilization unit, and provided with a plurality of second ultraviolet LEDs, so as to be exposed, at the circumferential surface of the external housing at sequentially fixed intervals such that the plurality of second ultraviolet LEDs are controlled to be turned on/off by being circuit-connected to the operation switch, wherein a circuit is connected such that the second ultraviolet LEDs are turned on when a first connection terminal comes in contact with a second connection terminal while the internal housing is protruding outwardly to the front of the external housing since the external housing is provided with the first connection terminal at a hooking edge protrudingly formed at the inner circumferential surface of the front end portion and the internal housing is provided with the second connection terminal at a hooking protrusion protrudingly formed at the outer circumferential surface of the rear end portion.La présente invention concerne un stérilisateur à ultraviolets à deux étages portatif comprenant : un c
