The invention discloses a bubble-free metal casting machine, and relates to the technical field of metal casting. The bubble-free metal casting machine comprises a box body, a cover plate is movably installed on the top of the box body, a smelting furnace is fixedly installed on the inner side of the upper end of the box body, a movable mechanism is arranged on the inner side of the box body, a flow guide mechanism is arranged on the inner side of the box body, and a closing door is movably installed at the lower end of the front face of the box body. The movable mechanism comprises a fixed cylinder, a discharging piece and a movable piece, the fixed cylinder is arranged on the inner side of the smelting furnace, the bottom of the fixed cylinder is fixedly connected with the bottom of the inner wall of the smelting furnace, and an opening is formed in the position, close to the bottom, of the outer surface of the fixed cylinder. According to the bubble-free metal casting machine, the moving mechanism and the flow guide mechanism are arranged, airflow is guided to drive the swing part to move, so that the moving barrel is driven to move, molten metal discharged from a smelting furnace smoothly flows into the collecting part, and the situation that the molten metal is attached to the inner wall of the moving barrel, and collection of the molten metal is affected is avoided.