The invention relates to the technical field of wood machining, in particular to a board splicing device. The board splicing device comprises a guide belt and a conveying belt connected with each other; a pressing disc for pressing boards is arranged above the guide belt; and the pressing disc freely moves in a rail on the upper side. The conveying belt is provided with a wheel grinding machine and a gluing machine. The conveying belt is used for conveying the boards onto a rolling table; a roller on the rolling table conveys the boards to one end of the rolling table; the conveying directionis perpendicular to the conveying direction of the conveying belt; a push rod oil cylinder for pushing non-glued surfaces of the boards is arranged at one end of the rolling table; the rolling table is provided with a baffle plate above the other end relative to the push rod oil cylinder; and the baffle plate is pushed through the oil cylinder to downwards move to butt against the side surfaces ofthe adjacent boards. The board splicing device automatically deburrs and glues the boards, and automatically arranges the plates in corresponding area for pressing to form square board surfaces. Theboard splicing device is simple in use and capable of improving the production efficiency.