The present invention relates to a lost child finding system in which a main server continuously monitors a distance between a child and a parent and a neighbor terminal which receives information about the child transmits the distance between the child and the parent when it is determined that the distance between the child and the parent is equal to or more than a predetermined distance, so that a location of the child is rapidly grasped, and a lost child finding method using the same. A lost child finding system according to the present invention includes a child terminal for storing child information including personal data of a child therein and including a wireless communication module; a parent terminal including a wireless communication module therein and for measuring a distance from the child terminal through communication with the child terminal; a main server including a storage medium for storing a unique number of the child terminal and the personal data of the child, wherein the main server executes a lost child tracking program when receiving the distance between the child terminal and the parent terminal from the parent terminal and determining that the distance between the child and the parent is equal to or more than a predetermined distance; and a plurality of neighbor terminals in which a lost child finding app is installed, respectively, wherein the neighbor terminals receive the personal data of the child from the main server and measure the distance from the child terminal to transmit the measurement result to the main server when the distance between the child and parent terminals from the main server is equal to or more that the predetermined distance.
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