Self-locking manual regulating valve is a kind of regulating valve with special functions, which in addition to the function of regulating valve, can also achieve flow quantification, which can effectively solve the problem of uneven heating and cooling at room temperature in the heating (air conditioning) system. Since the valve is equipped with an opening degree indication, an opening locking device and a small pressure measuring valve for flow measurement, as long as the appropriate size of the balance valve is installed at each branch and user inlet, and locked after one-time debugging with a special intelligent instrument, the total water volume of the system can be controlled within a reasonable range, which can overcome the unreasonable phenomenon of "large flow and small temperature difference", and is an ideal product in the heating system.