Power-down protection circuit and method and electric energy meter

The invention discloses a power-down protection circuit and method and an electric energy meter. The power-down protection circuit comprises: a sampling circuit, wherein the input end of the samplingcircuit is connected with the output end of a power module, and the sampling circuit is used for monitoring the output voltage of the power module and outputting a control signal when the output voltage of the power module is lower than a first threshold value; a main chip, wherein the input end of the main control chip is connected with the sampling circuit, and the main control chip is used foroutputting a control instruction to the storage chip after the sampling circuit outputs the control signal; and a storage chip, wherein the input end of the storage chip is connected with the main control chip, and the storage chip is used for triggering and storing the electric energy data of the electric energy meter based on the control instruction. According to the invention, the problems of storage device damage and d