The invention provides a large vertical type alternating current permanent magnet moment direct drive motor installing structure facilitating setting. The large vertical type alternating current permanent magnet moment direct drive motor installing structure comprises a motor stator and a motor rotor; a rotor guide disc, a rotor installing disc and a rotor supporting structure are arranged in themotor rotor, wherein the rotor installing disc and the motor rotor are fixedly connected; a device spindle penetrates the rotor installing disc and the rotor supporting structure; the rotor installingdisc is in interference fit connection with the device spindle via a power lock; the bottom end of the device spindle is provided with a motor speed measuring structure, a thrust ball bearing and a round net, wherein the motor speed measuring structure, the thrust ball bearing and the round nut are in successive leaning connection; the rotor supporting structure is of a cylindrical cage structure, with the upper end being fixedly connected to the rotor installing disc and the lower end being pressed against the motor speed measuring structure. The structures, such as the rotor supporting structure, the thrust ball bearing and the round nut, are arranged axially to support the weight of the rotor during setting of a motor, so that motor setting can be completed without disconnection of thedevice spindle and main device loads.