A bidirectional moving micro-robot system comprising: a first body having a plurality of legs foldably/unfoldably connected thereto; a second body having a plurality of legs foldably/unfoldably connected thereto; and a connection member having both end portions respectively connected to the first body and the second body, wherein the length of the connection member exposed between the first body and the second body is extended or contracted, wherein the connection member is a coil-type spring which is flexibly bent, wherein the operation of folding/unfolding the plurality of legs provided to the first body and the operation of extending/contracting the length of the connection member are performed by the movement of a motor, and wherein the first body comprises: the motor having a body and a shaft; a first cylinder connected to the motor to surround the body of the motor; and a cover for accommodating the motor and the first cylinder in the interior thereof, wherein: a plurality of leg latching grooves are formed at an outer circumferential surface of the first cylinder; the plurality of legs connected to the first body are radially disposed about the central axis of the first body, and each of the legs is hinge-fixed to the cover; and as the first cylinder is rotated by the rotation of the body of the motor, an end portion of each of the legs connected to the first body is latched by the interference of each of the leg latching groove so that the legs are folded or unfolded. a first body having a plurality of legs foldably/unfoldably connected thereto; a second body having a plurality of legs foldably/unfoldably connected thereto; and a connection member having both end portions respectively connected to the first body and the second body, wherein the length of the connection member exposed between the first body and the second body is extended or contracted, wherein the connection member is a coil-type spring which is flexibly bent, wherein the operation of folding/unfolding the plurality of legs provided to the first body and the operation of extending/contracting the length of the connection member are performed by the movement of a motor, and the motor having a body and a shaft; a first cylinder connected to the motor to surround the body of the motor; and a cover for accommodating the motor and the first cylinder in the interior thereof, wherein: a plurality of leg latching grooves are formed at an outer circumferential surface of the first cylinder; the plurality of legs connected to the first body are radially disposed about the central axis of the first body, and each of the legs is hinge-fixed to the cover; and as the first cylinder is rotated by the rotation of the body of the motor, an end portion of each of the legs connected to the first body is latched by the interference of each of the leg latching groove so that the legs are folded or unfolded. a plurality of leg latching grooves are formed at an outer circumferential surface of the first cylinder; the plurality of legs connected to the first body are radially disposed about the central axis of the first body, and each of the legs is hinge-fixed to the cover; and as the first cylinder is rotated by the rotation of the body of the motor, an end portion of each of the legs connected to the first body is latched by the interference of each of the leg latching groove so that the legs are folded or unfolded.