The utility model discloses a can be applied to microcomputer control protection device's energy storage system, it includes power module and energy storage module, external power source is connected to power module's input, and the output provides working power supply for microcomputer control protection device, rectifying and wave -filtering unit and DCDC unit connect gradually between input and the output, the output of rectifying and wave -filtering unit is connected with input voltage detecting element, and the output of DCDC unit is connected with output voltage detecting element, each energy storage module includes charging control switch, charging circuit unit, super capacitor group, the circuit unit that discharges respectively, control switch and the control unit discharge, the control unit is according to the voltage signal that input voltage detecting element and output voltage detecting element detected, controls the charging control switch and the control switch's that discharges break -make state respectively to control super capacitor group is in charged state or discharge condition. The utility model discloses the influence that input voltage falls temporarily or micro -interruptions causes can be avoided to equipment, the consumption level of device can be satisfied simultaneously.