The invention discloses a rotary steel frame of a lift. The rotary steel frame mainly comprises a motor, a lifting frame, a transmission gear, a rotary support, a base plate and an installation bottomplate; the lifting frame comprises two I-shaped stand columns, and the two I-shaped stand columns are installed on the two sides of the base plate respectively; the motor is installed on the liftingframe, the transmission gear is installed on an output shaft of the motor, the motor drives the transmission gear to rotate, the transmission gear is meshed with the outer ring of the rotary support,the outer ring of the rotary support is fixedly connected to the installation bottom plate, and the transmission gear rotates around the outer ring of the rotary support and drives the lifting frame to rotate around the axis of the lifting frame; the base plate is fixedly connected to the inner ring of the rotary support, the lifting frame is fixedly connected to the base plate, and when the lifting frame rotates, the base plate and the two I-shaped stand columns rotate along with the lifting frame. Rolling bearings are adopted for supporting the two ends of the lifting frame, so that resistance is reduced in the rotating process; hollow materials are adopted to be assembled into the I-shaped stand columns, so that the overall mass of the steel frame is reduced, and the working efficiencyis improved.