The utility model discloses a multi-channel regulated power supply system with a self-checking function, which comprises a filter circuit, protection circuits, a voltage regulator circuit, an energy storage circuit and an output feedback circuit. The multi-channel regulated power supply system has the beneficial effects that a power supply can be prevented from abnormal operation caused by the external harsh environment according to the multi-channel regulated power supply system with a very good anti-interference ability, and the power supply can be prevented from damage caused by an external high magnetic field, a surge or a lightning stroke or the like; and when the power supply breaks down, signals can be sent out timely by the self-checking function to enable workers to be aware of device running states in first time, and unnecessary losses can be prevented, and therefore the multi-channel regulated power supply system plays an important role in ensuring the device safe operation.