The invention provides an electronic tag. The electronic tag comprises a release paper layer, a first adhesive layer, a metal-resistant material layer, a chip layer, a second adhesive layer and a fragile paper layer which are arranged in sequence, wherein a plurality of grooves are formed in one side, opposite to the chip layer, of the metal-resistant material layer, a silicone oil layer is arranged between the groove surfaces and the chip layer, the chip layer adopts a flexible circuit board, and a processor, a patch sensor, a radio frequency circuit and a communication unit are arranged on the flexible circuit board, and the patch sensor, the radio frequency circuit and the communication unit are respectively connected with the processor. The electronic tag has a certain extended function, and is high in metal resistance and not prone to damage.