The invention provides a magnet steel assembly system. The magnet steel assembly system includes a reference platform, a rotor supporting platform arranged at the center of the reference platform, and at least one magnet assembly device which is arranged on the rotor supporting platform in a surrounding manner; a rotor to be equipped with magnets is rotationally connected with the rotor supporting platform; and the magnet assembly device includes a magnet feeding device and a magnet push-in device which are arranged on the same supporting base. With the magnet steel assembly system adopted, optimal allocation of resources can be realized, and manpower can be saved, and operation can be facilitated, and work efficiency can be greatly improved, and magnet installation of mass wind generating sets can be benefitted.