The invention discloses a drilling device for board machining. The device comprises a base and a supporting top plate, a movable plate is arranged below the supporting top plate, a drilling motor is arranged on the bottom of the movable plate, a machining table is arranged on the upper surface of the base in a sliding manner, a drive motor is arranged on one side of the machining table, the drivemotor is connected with the machining table through an electric push rod, baffles are arranged on the two sides of the top of the machining table, concave opening clamping plates are arranged on the upper end of the inner wall of the baffles, thread holes are formed in the top sides of the concave opening clamping plates in a penetrating manner, thread rods are in threaded connection into the thread holes, and pressing blocks are arranged on the bottom ends of the thread holes. Under cooperation use of the concave opening clamping plates, the thread rods and the pressing blocks, the board canbe firmly fixed to the machining table, the phenomenon that in the drilling process, the board slides, and moves, and the drilling precision is affected is avoided, drilling effect is improved, the structure is simple, use is convenient, multi-point drilling of the board is achieved, and the drilling efficiency is high.