A self-generating power supply apparatus includes a power generating body, an energy harvester, and a power consumer. The power generating body generates an electromagnetic field when a force is applied, an energy of the electromagnetic field is received by the energy harvester and subsequently transferred to the power consumer; or alternatively, the energy harvester is not provided and the energy of the electromagnetic field is directly received and used by the power consumer. The energy of the electromagnetic field is harvested by the energy harvester contacting or not contacting the power generating body, and then is converted into electrical energy, which is transferred out in a wired or wireless manner to enable self-generating power supply for the apparatus. The self-generating power supply apparatus has an immeasurable impact on the development in the fields such as wearable devices, small mobile communication devices, Internet of Things, new energy etc.