The invention discloses an automatic production line of a light partition board, which comprises a burdening device, a grouting device, a wallboard forming machine, a tube filling machine, a tube drawing bench, a still kettle, a lifting machine, a travelling rail and a shuttle bus, wherein the travelling rail reaches an area where the burdening device, the grouting device, the wallboard forming machine, the tube filling machine, the tube drawing bench, the still kettle and the lifting machine are installed and is connected with the burdening device, the grouting device, the wallboard forming machine, the tube filling machine, the tube drawing bench, the still kettle and the lifting machine, and the shuttle bus walks on the travelling rail. According to the invention, the apparatuses in the procedures are connected by the travelling rail to form a wallboard production stream line for realizing mass production through a plurality of wallboard machines, so that the production line has low labor intensity, stable product stability, high production efficiency and low equipment investment, and the production line is suitable for use of enterprises with large production capacity.