The invention provides an intelligent switching device, a control system and a control method for a microgrid. The intelligent switching device includes a main circuit switch module which is configured to connect or disconnect the microgrid and a main grid by correspondingly switching on or off the main circuit switch module, a signal detector which is configured to detect voltage signals of the microgrid and the main grid on the two sides of the switch and a current signal flowing through the main circuit switch module, and a central controller which is configured to control the switching onor off of the main circuit switch module according to detection results of the signal detector so as to make the microgrid switch between a grid-connected operation mode and an isolated network operation mode.