Provided are a switching device with an auxiliary power unit and a wireless receiver function, and a lamp system using the same, wherein the switching device is connectable to a lamp and includes a power switching portion, which transmits external electricity to the lamp when in a power supplying mode and stops doing so when in a power-off mode; and the auxiliary power unit in the switching device keeps powering other components of the switching device, so while the power switching portion is in the power-off mode, a wireless module in the switching device can still transmit a wireless signal from a wireless controller to a control unit to adjust the power switching portion to the power supplying mode. Thus, even when the switching device is in a power-off state, a user can control the lamp by sending a wireless control signal to the switching device through the wireless controller.