The invention relates to the technical field of medical health care, in particular to a device and method for repairing postpartum diastasis recti abdominis. The device comprises a main unit, electrode wires and electrode sheets, the main unit is internally provided with a microprocessor, a Bluetooth circuit, a liquid crystal display circuit, a key circuit, an alarming circuit, a charging management circuit, a voltage adjusting circuit, a power switching circuit, a power management circuit, a first-level boosted circuit, a second-level boosted circuit, a protection circuit, a bridge-type stimulation circuit, a waveform control circuit, a charging management circuit, a lithium battery and an adaptor, the output end of the main unit is connected with the electrode wires through the electrodesheets, the electrode sheets are applied to the human body, and diastasis recti abdominis is restored through electric stimulation therapy. The electric stimulation therapy is adopted for the deviceand method, the muscle force can be exercised and reinforced, the muscular atrophy of disuse is prevented and treated, the muscle can be subjected to functional movement, and thus diastasis recti abdominis is repaired.