The traditional polymer liquid dispensing system is difficult to automatically adjust the water volume and motor speed, complicated operation, low automation degree, and cannot meet the requirements of polymer oil dispersal system on offshore platform. In view of the above problems, the polymer liquid dispensing system is controlled by PLC, and the hardware adopts Siemens PLC, pressure sensors, liquid level sensors, electromagnetic flow meters, flow regulating valves, inverter motors and actuators, and the PLC control program is written by protherm software, which realises the input/output processing of analogue and digital quantities, and the PID automatic adjustment of the speed of inverter motors and the opening of flow regulating valves; WinCC software is used for interface design to realise on-line dynamic monitoring and control of the polymer liquid dispensing system.