A smart switch applied to a smart home system is connected to a power supply and at least one electronic device. The smart switch includes a screen, a power detecting unit configured to detect real-time electrical information of the electronic device, a processor unit including a calculating module configured to calculate total electricity consumption of the electronic device and a control module configured to control the screen to display instantaneous electrical information and the total electricity consumption, and a communication unit configured to connect the smart switch to a gateway of the smart home system in wired or wireless manner, and send the electrical information and the total electricity consumption to the gateway. A smart home system is also provided.