Power supply circuit with overcurrent protection function

The invention belongs to the technical field of power source management, and relates to a power supply circuit with an overcurrent protection function. Compared with an existing related power supply module, a self power supply link mode is adopted in the internal power supply circuit, the number of used high voltage transistors is greatly reduced, and the territory area is effectively saved; besides, after overload protection is integrated, the problem that a chip fails under a too large load is effectively avoided, and the reliability of the system is improved; by means of power supply excess protection, uprush peaks caused by jumping from overloading to underloading is effectively improved, transient responses are improved, and the precision of output voltage is effectively improved.