The invention relates to a wood board processing device with limiting, material-cutting and fixing functions, pertaining to the technical field of processing equipment. The wood board processing device comprises a workbench, on which a cutting and sawing disc used for cutting is arranged. The left side of the cutting and sawing disc on the workbench is a feeding part. The right side of the cutting and sawing disc on the workbench is a discharge part. A material-cutting block used for separating two cut wood boards is arranged on the workbench for the feeding part. A horizontal section of the material-cutting block is of a triangular structure with one corner facing the cutting line of the cutting and sawing disc. An infrared induction device is designed on the side surface of the workbench for the feeding part. The side surface of the workbench, corresponding to the cutting and sawing disc, of the feeding part is provided with a sliding rail, on which a sliding board matching the sliding rail in a sliding mode is arranged. Two fixing supports are arranged on the sliding board from the left to the right in sequence and vertically provided with mutually-independent screw rods in a penetrating mode. The screw nuts are provided with nuts matching threads. The wood board processing device with limiting, material-cutting and fixing functions is low in cost and helps to save time and force and is safe and reliable.