Erasing power-down data protection method and device for flash memory

The invention discloses an erase power-down data protection method and device for a flash memory, and the method comprises the steps: monitoring a first voltage of the flash memory by a voltage monitoring module, determining whether the first voltage is smaller than a preset voltage threshold value or not by the voltage monitoring module, and when the first voltage is smaller than the preset voltage threshold value, starting the flash memory; the voltage monitoring module sends the first interrupt signal to the main control module, and the main control module responds to the first interrupt signal and executes data protection operation on the flash memory. It can be seen that when the flash memory is powered off abnormally in the erasing process of the flash memory, the data of the non-erasing area of the flash memory can be protected, meanwhile, more flash memory models can be compatible, the risk that the data of the non-erasing area of the flash memory is tampered is reduced, the requirement for the write