This 4 heads semi-automatic barrel filling machine is mainly composed of PLC, touch screen, cylinder, angle seat valve and electrical control components. The utility model has the advantages of simple overall structure, small occupied area and easy operation. This machine adopts industrial high-speed PLC to control the liquid flow rate (control precision is 0.01s), and the filling precision is high. It is an ideal choice for large and medium-sized enterprises to fill glass water, vehicle urea or pesticides. The filling amount can be adjusted freely through the touch screen, and the operation is simple and the precision is high.