The work aims to improve the quality and efficiency of beer canning in the industry, so as to precisely control the liquid level in liquid storage tank. The mathematical model of the experiment was established with the double-holding tank. The simulation was carried out under the two algorithms of PID cascade control and DMC control, and the parameters were tuned. The simulation results were compared and analyzed. OPC technology was applied to achieve the data communication between King ACT and King View, so as to design the monitoring interface. The results showed that, DMC control absorbed such characteristics as PID rapidity and fast response of cascade control, which made the whole system featured by fast response, good stability and small overshoot. The monitoring interface could visually reflect the control process in real time. Characterized by good control performance, strong robustness and low cost, the control system can be used to improve the efficiency of beer canning machine.