Is it dangerous to make powder from magnets

No danger. Magnet powder is made by grinding magnets into powder, the kind of powder has a high degree of magnetism, commonly used in the production of magnetic cores, inductors and other electronic components, in the correct use and handling, magnet powder is not dangerous. Due to the strong magnetism of the magnet powder, it will cause interference or injury to people carrying pacemakers or other medical equipment, avoid the magnet powder near these devices.