The present invention relates to a portable IoT terminal having a mosquito repellent function and a method and system for providing a maltreatment service using the same, and a portable IoT terminal having a mosquito repellent function according to the present invention, A first ultrasonic generator for generating an ultrasonic wave in a predetermined frequency range corresponding to the frequency sensed by the first sensing unit, A second sensing unit for further sensing a frequency generated by the wing of the adjacent mosquito after the additional operation is performed, and a second sensing unit for sensing the frequency generated by the first ultrasonic generator when the frequency sensed by the second sensing unit is small, Of the frequency band adjacent to the specific frequency range when the frequency of the frequency band is the same or larger than that of the frequency band Combating mosquitoes unit including a second ultrasound generating for generating sequentially generating a mosquito-combating possible frequency corresponding to the frequency and mosquitoes； And a local area communication module for transmitting and receiving location information within a predetermined radius through a wireless communication with a specific terminal set in advance in pairs so that position information of a specific terminal transmitted and received through the local communication module is not detected for a predetermined time It is possible to generate a light signal. Accordingly, it is an object of the present invention to provide a portable IoT terminal that can be easily carried and worn on a human body, thereby generating harmless ultrasonic signals to the human body, thereby making it possible to eliminate mosquitoes during infant companionship, There is an effect of providing a portable IoT terminal having a mosquito prevention function capable of being confirmed and a method and system for providing a childproof service using the same.본 발명은 모기퇴치기능을 구비한 미아방지용
