The air-filling and sand filling technology are adopted in the design process of the automatic horizontal parting flaskless green sand molding machine. The top and bottom parts are combined and shot on the four columns at the same time, and then compacted. After molding, the top part and bottom part is respectively demolded, removable flask, and smoothly assembled, and the sand mold is pushed out by the cylinder. The use of the conveyor line enables the automated production of castings. The automatic horizontal parting flaskless green sand molding machine has been improved on the basis of the previous horizontal molding machine, and the upper, middle and lower boxes are fixed on the four columns at the same time, which ensures the accuracy of the box and solves the problem of the wrong box; The matching molding production line is more flexible, and can adapt the hand-pushing rolling conveyor method and the automatic trolley roller conveying method.