Industry shortage: C ompared with the nuclear fission used in conventional nuclear power plant s, nuclear fusion is powered by deuterium and tritium, stored in seawater. The quantity is rich. And the fusion product is helium, not radioactive waste. Therefore, fusion energy is a clean and efficient new energy, and all countries are studying controllable nuclear fusion technology. The tokamak fusion device is well recognized for exploring and solving future fusion reactor engineering and physics problems. One of the most effective pathways. High-field magnetometers are required for fusion plasma optimization and control in the device. However, at present, no magnetometer can work stably in the extreme radiation, high temperature and high magnetic field environment inside the tokamak device. Empowered value: Magnetometer based on quantum precision measurement technology can be normal in high temperature, high pressure and strong radiation environment. Work, expected to provide diagnostic capabilities for tokamak devices and magnetic field devices in other extreme environments.