An electric signal adapting device includes at least one first adapting interface and at least one first adaptor. The at least one first adapting interface comprises a magnetic component and a magnetic sensing component. The first adaptor is placed in correspondence with the first adapting interface. The first adaptor is electrically connected to each of the corresponding at least one first adapting interface for transferring the DC electric signal and connecting the DC electric signal to an external device. The magnetic component is configured to attract the at least one first adaptor. The magnetic sensing component is configured to determine whether the at least one first adaptor is correctly placed. When the magnetic sensing component determines that the at least one first adaptor is correctly placed, the at least one first adapting interface transfers the DC electric signal to the at least one first adaptor.