Power-down protection circuit and electronic device

The utility model provides a power-down protection circuit and an electronic device. The power-down protection circuit comprises a first protection unit, a second protection unit and a third protection unit, and the second protection unit comprises a second one-way conduction device and an energy storage part. The first one-way conduction device and the second one-way conduction device play a rolein isolating the MCU from other power consumption devices, so that the energy storage part discharges to be consumed by the MCU during power failure, the normal work of the MCU is ensured, and RAM data is ensured to be stored. The circuit does not need to be matched with software to judge the value of the terminal voltage and close the irrelevant power consumption module, and only two one-way conduction devices are needed to isolate the MCU from other power consumption devices, so that the power failure protection of the circuit is realized, that is, the circuit is simple to operate, and a better power failure protec