This dual-head liquid filling machine, combined with an extended conveyor system, forms a stable and efficient semi-automatic/fully automatic filling unit. The equipment uses two filling heads working synchronously, suitable for rapid filling of small to medium batches of liquids, oils, and other products. The extended conveyor belt design expands the bottle loading, buffer, and bottle exit areas, allowing for flexible connection between upstream and downstream processes (such as capping and labeling) for smoother production line integration. It offers high filling accuracy, supports rapid bottle type switching, has a compact structure, and is easy to operate, making it widely applicable to the flexible production and packaging needs of the food, daily chemical, and chemical industries.