The invention provides a switch board in an optical fiber switching system. A plurality of switch holes are formed on the switch board, wherein one end of a cord circuit optical fiber is inserted in the switch holes from lower side, circuit optical fiber linkers used for fixing external circuit optical fibers are inserted in the switch holes from upside, a cord circuit optical fiber fixing part used for fixing the end part of a cord circuit optical fiber is inserted in the switch holes from the lower side of the switch holes and comprises a clamping sleeve, a sleeve, a press piece and a cap from top to bottom in sequence, wherein the clamping sleeve, the sleeve, the press piece and the cap are respectively provided with a through hole penetrating from the top down. By using the switch board disclosed in the invention, the circuit optical fiber linkers can be inserted and fixed in the switch holes more easily.