The invention relates to a high-yield flexible board and an assembly system thereof, comprising a flexible board body, a main via area, a standard pad area and a pair of positioning holes, wherein themain via area and the standard pad area are respectively disposed on the two ends of the flexible board body, the pair of positioning holes are adjacent to the standard pad area, and the pair of positioning holes are symmetric along the vertical center line of the flexible board body; a set of main vias with electrical networks in one-to-one correspondence with electrical networks of pins of an optoelectronic device or a module required to be manufactured or tested are arranged in the main via area; and a set of standard pads that correspond to the electrical networks of the main vias and conform to industry standards are arranged in the standard pad area. The invention has the beneficial effects that abnormalities caused by soldering and assembly of components whose pins are deviated toone side but the external dimension is completely symmetrical are avoided, and the conditions such as bad connection or even misalignment press fit of pads of the flexible board and the test board arenot prone to appearance even the pads are densely arranged.