A disk array apparatus provided includes: a power module, a control unit, a first disk group, a second disk group, and a standby power unit. The power module includes a first input side connected to the power input lead and a second input side connected to the standby power unit. The power module further includes a first output side connected to the second disk group and a second output side connected to the first disk group and the control unit. When the power input is normal, the input power is output through the first output side and the second output side of the power module. When the power input of the power input lead is abnormal, the power input by the standby power unit is output through the second output side of the power module. Therefore, the disk array apparatus under the present utility model ensures data to be securely stored in the first disk group against loss, reduces the standby power capacity of the standby power unit, thus reducing the cost of the standby power unit.