The invention relates to a rigid-flex board and a manufacturing method thereof, the rigid-flex board comprises a first flexible core board, a second flexible core board, a first circuit board and a second circuit board. One side surface of the first circuit board and one side surface of the second circuit board are connected with the first flexible core board, the other side surface of the first circuit board and the other side surface of the second circuit board are connected with the second flexible core board. In the rigid-flex board, regions, corresponding to an interval between the firstcircuit board and the second circuit board, on the first flexible core board and the second flexible core board are the regions which can be bent, thus, a bending function of the rigid-flex board is realized. Moreover, the first flexible core board and the second flexible core board have enough signal transmission lines for conducting electronic elements on the first circuit board and the second circuit board. Moreover, transmission signals of an external device are directly transmitted to the first flexible core board and the second flexible core board at an external surface, thus, the transmission signals are free from producing loss while passing through via holes.