A shove board game system and playing method thereof includes: a game host to process a shove board game program and provide a picture of a chessboard and an information window and reset status of all pieces on the chessboard, a display device communicating with the game host to display the chessboard, pieces and the information window and related information, and an input device communicating with the game host to receive operations of players to proceed the shove board game. The chessboard is octagonal and has multiple longitudinal and transverse lines in directions of X and Y axes and diagonal straight lines formed at an angle of 45 degrees against the X and Y axes. The lines cross one another to form points of intersection. The pieces are positioned on the points of intersection.