The digital locking balance valve is a static hydraulic balance valve. It has a constant percentage flow characteristic curve. It is suitable for centralized quantity regulation, centralized quality adjustment and phased change of flow rate adjustment system. When the system flow changes, each branch of the digital locking balance valve is installed. The flow of each user will be according to the flow rate. Increase or decrease in proportion, and maintain the flow distribution plan at initial adjustment. The digital lock balance valve also has opening and opening locking functions. The valve can be used in heating and air conditioning water system to achieve the effect of saving heat and electricity.