The invention relates to a smart switch with operational stability and belongs to the technical field of switchgears for power grids. The smart switch provided by the invention has the advantages of convenience in installation and debugging, high operation efficiency and operational stability. The smart switch of the present invention comprises a primary body and a secondary body, wherein the primary body is provided with switches and a switch operating mechanism, and the primary body is arranged at the upper end of the secondary body in a connected manner. The smart switch is characterized in that the primary body is connected with the monitoring and communication circuit of the secondary body through a line connection interface; the secondary body comprises a shell; a measurement and control module, a coupling power source module and a storage battery module are arranged in the shell; the rear end of the shell is provided with a connection circuit board; the measurement and control module, the coupling power source module and the storage battery module are all electrically connected through the connection circuit board; a heating sheet and a temperature control unit are arranged in the shell; the control signal output port of the temperature control unit is connected with the control signal input port of the heating sheet.