An appliance for the treatment of a liquid food comprises a container (2) for the liquid food, a support (3) for the container (2), a cover (4) to close container (2), a hermetically sealed chamber (6) within the cover (4), a tool (5) rotating inside the container (2) for the treatment of the liquid food, a primary electrical winding (9) held by the support (3) and suitable to transfer energy by magnetic induction to a secondary electrical winding (7) positioned inside the hermetically sealed chamber (6), and a motor (8) driving the rotation of the tool (5) positioned within the hermetically sealed chamber (6) and electrically powered by the secondary winding (7).