A multi-link bridge for an undercarriage system, the undercarriage system comprising: a center frame and a roller frame which are designed independently from each other, wherein link connection brackets (11, 12, 21, 22) are installed respectively at opposite side surfaces of the center frame and the roller frame; the multi-link bridge comprising: a link bridge to be coupled to the link connection brackets (11, 12, 21, 22), for connecting the center frame and the roller frame, wherein the link bridge comprises a link housing having a body with two coupling holes (33a, 33b) which are formed in an inside of the body so as to pass through the body in parallel to each other and are adapted to accommodate connection pins (32a, 32b) for connecting to the center frame and the roller frame, wherein the link connection pins (32a, 32b) are formed with a diameter enough to be inserted into the coupling holes (33a, 33b) of the link housing and rotatably couple each of the link connection brackets (11, 12, 21, 22) of the center frame and the roller frame to each of the coupling holes (33a, 33b) of the link housing, characterized in that the coupling holes (33a, 33b) are formed with an inclined surface having a predetermined angle θ from a center portion of the link housing toward an outside at an inner peripheral surface thereof, thereby enabling the roller frame connected to the center frame to rotate along a longitudinal direction B of the roller frame by the inclined surface. a center frame and a roller frame which are designed independently from each other, wherein link connection brackets (11, 12, 21, 22) are installed respectively at opposite side surfaces of the center frame and the roller frame; the multi-link bridge comprising: a link bridge to be coupled to the link connection brackets (11, 12, 21, 22), for connecting the center frame and the roller frame, wherein the link bridge comprises a link housing having a body with two coupling holes (33a, 33b) which are formed in an inside of the body so as to pass through the body in parallel to each other and are adapted to accommodate connection pins (32a, 32b) for connecting to the center frame and the roller frame, wherein the link connection pins (32a, 32b) are formed with a diameter enough to be inserted into the coupling holes (33a, 33b) of the link housing and rotatably couple each of the link connection brackets (11, 12, 21, 22) of the center frame and the roller frame to each of the coupling holes (33a, 33b) of the link housing, characterized in that the coupling holes (33a, 33b) are formed with an inclined surface having a predetermined angle θ from a center portion of the link housing toward an outside at an inner peripheral surface thereof, thereby enabling the roller frame connected to the center frame to rotate along a longitudinal direction B of the roller frame by the inclined surface. a link bridge to be coupled to the link connection brackets (11, 12, 21, 22), for connecting the center frame and the roller frame, wherein the link bridge comprises a link housing having a body with two coupling holes (33a, 33b) which are formed in an inside of the body so as to pass through the body in parallel to each other and are adapted to accommodate connection pins (32a, 32b) for connecting to the center frame and the roller frame, wherein the link connection pins (32a, 32b) are formed with a diameter enough to be inserted into the coupling holes (33a, 33b) of the link housing and rotatably couple each of the link connection brackets (11, 12, 21, 22) of the center frame and the roller frame to each of the coupling holes (33a, 33b) of the link housing, characterized in that the coupling holes (33a, 33b) are formed with an inclined surface having a predetermined angle θ from a center portion of the link housing toward an outside at an inner peripheral surface thereof, thereby enabling the roller frame connected to the center frame to rotate along a longitudinal direction B of the roller frame by the inclined surface.