The utility model discloses a self-powered RFID tag in a transformer station. The self-powered RFID tag is composed of four modules including a MK antenna, a MK power transforming and adjusting circuit, an RFID tag antenna, and a transmit-receive circuit and memory of an RFID tag. The self-powered RFID tag in the transformation station has a characteristic of changing an original adverse factor in an environment into an energy source for improving the performance of a tag chip and providing the tag chip with good communication quality.