A gyrotron is a vacuum tube that generates high-power electromagnetic waves to heat plasma in a fusion device. Gyrotron superconducting magnets provide the required magnetic field for the gyrotron to constrain electron motion. This 170 GHz superconducting magnet system for the gyrotron uses conduction cooling, using only a GM Cryo-cooler as the cooling source, and can cooldown the magnet from room temperature to 3.6 K in 64 hours, with the highest magnetic field of the coil of nearly 9 T and the center field of up to 7.28 T. The room-temperature aperture diameter of 165 mm, and the deviation of the magnetic field axis from the geometric axis of the magnet is less than 0.08 mm, and it can provide the electron-constrained magnetic field for 170 GHz gyrotron.