Double-coating unit for zero-time switching coating

The invention relates to a double-coating unit for zero-time switching coating, and belongs to the technical field of roller coating. The double-coating unit comprises a first coating unit and a second coating unit arranged below the first coating unit. The second coating unit and the first coating unit are the same in structure. The first coating unit comprises a mounting frame, an inclined supporting plate is fixed in the mounting frame, and an inclined supporting rod is arranged on the inclined supporting plate in a penetrating mode; a magnet box is fixed to the bottom face of the inclined supporting plate, an electromagnet is fixed to the bottom face of the magnet box, and a magnetic attraction plate attracted to the electromagnet is fixed to the peripheral face of the inclined supporting rod. A rotating roller frame is fixed to the bottom end of the inclined supporting rod, and a coating roller is rotationally installed in the rotating roller frame. A power assembly used for supplying power to an electro