The invention relates to an automatic wood board conveying device. The automatic wood board conveying device comprises a machine frame, a wood board conveying mechanism, a wood board accommodating mechanism, a wood board jacking mechanism, a wood board pushing mechanism, a transmission mechanism and a power mechanism. The wood board accommodating mechanism is positioned on an upper machine frame,the wood board conveying mechanism is positioned in front of the upper machine frame and the wood board accommodating mechanism, and the wood board pushing mechanism and the wood board jacking mechanism are correspondingly positioned in the machine frame and below the wood board accommodating mechanism. The transmission mechanism and the power mechanism are positioned on a bottom machine frame, the wood board conveying mechanism, the wood board jacking mechanism and the wood board pushing mechanism are correspondingly connected with the transmission mechanism, and wood boards at the bottom layer are sequentially pushed back and forth through the wood board pushing mechanism, and enter the wood board conveying mechanism, at the same time, the wood board jacking mechanism jacks up the rest of the wood boards to reduce the pushing resistance of the wood board pushing mechanism. The automatic conveying of the wood boards with different sizes is realized, the labor force input is reduced, the safety and work efficiency are improved, and traditional manual operation of the wood boards is changed.