a method for manufacturing a rigid - flexible printed circuit boards includes following steps . firstly , a flexible substrate is provided . secondly , at least one slit is defined in the flexible substrate . thirdly , a rigid substrate having a structure corresponding to the flexible substrate is provided . fourthly , the flexible substrate is laminated to the rigid substrate to obtain a laminated substrate . fifthly , part of the rigid substrate is removed . sixthly , the laminated substrate is cut along an imaginary boundary line to remove waste portion of the laminated substrate . thus , a rigid - flexible printed circuit board is obtained .