The invention discloses a cooling medium insulated isolation and circulation device which comprises at least two transitional hoppers arrayed in sequence from top to bottom and a recycling hopper, wherein each transitional hopper can convey a cooling medium to the adjacent hopper below; the bottom of the recycling hopper is connected with one end of a guide pipe; the other end of the guide pipe extends into the transitional hopper at the uppermost part; and by interlocking control, at least one of the transitional hoppers cannot convey the cooling medium to the adjacent hopper below within the same period of time. The cooling medium insulated isolation and circulation device can circulate the cooling medium and disconnect a cooling medium loop; the cooling medium can be a conductive medium, so that the resistance of high-voltage equipment can be reduced, the heating volume can be reduced, and heat dissipation can be quickly assisted, therefore, the size of the equipment is reduced, and the energy saving effect of the equipment is enhanced; and for the conventional cooling medium, the requirement on the insulation performance of the medium can be omitted, and the operation safety of the equipment is improved.