Therefore, it is necessary to design a liquid level control system to automatically adjust the flow rate of liquid level to improve the utilization rate of resources. Especially in the dynamic state, using the appropriate method to detect and control the liquid level, can receive a good production effect. Because of the different liquid level detection applications, performance index and technical requirements also have differences, but apply to become a common trend of the development of effective measurement, with the development of electronic technology and computer technology, graphical LabVIEW virtual instrument development platform is the combination of computer and instruments system products, compared with the traditional instrument operation and data processing capability, its degree of facilitation and high cost performance, mainly in the form of software to complete all function, liquid level control system based on LabVIEW is compared to the traditional liquid level control