In the present invention, a micro current stimulator is connected to an earphone terminal of a portable terminal such as a smart phone, and a driving of a micro current stimulator is controlled by a portable terminal equipped with a predetermined application program. The micro current stimulator includes an earphone jack safety controller Which is applied to the earphone terminal of the portable terminal, which can stably maintain the ground and power terminals even when the ground is located at a different position according to the type of the earphone jack connection terminal and drive the micro current stimulator stably even at a low output current Current stimulator and a control method thereof. A method of driving a micro current stimulator connected to an earphone terminal of a portable terminal, the method comprising: receiving a start signal of a start button as a user turns on a start button on the portable terminal, Waiting for the start button to be on； When the start button is turned on, the portable terminal generates a test signal and outputs the test signal to at least one of the right sound signal end of the earphone jack or the left sound signal end, in order to check whether the electrode patch is attached to the user. A test signal generating step； Determining whether the first electrode is attached or not by comparing whether the feedback signal received from the feedback output terminal of the micro current stimulator is equal to a preset reference range or a reference signal by comparing the portable terminal with the electrode pad； If it is determined that the electrode pad is not attached, the portable terminal displays on the screen that the electrode pad is not attached, and the start button An electrode non-contact notifying step of returning to the on-wait step； In the step of determining whether or not the electrode is attached, if it is determined that the received feedback signal has an electrode pad attached to a predetermined referen
