Lifting device for building curtain wall construction and lifting method of lifting device

The invention discloses a lifting device for building curtain wall construction. The lifting device comprises a gravity center base, wherein a case is mounted on one side of the top end of the gravity center base, a lifting arm is mounted on the other side of the top end of the gravity center base, a traction roller is mounted at the top end of the gravity center base and between the front end and the rear end of the case, and a traction steel rope is wound on the periphery of the traction roller; a hanging mechanism is installed at the tail end of the traction steel rope, a display screen is installed on the upper portion of the front face of the case, control keys are installed on the lower portion of the front face of the case, an adjusting motor is installed in the middle of the upper portion of the interior of the case, a threaded column is installed on one side of the adjusting motor and penetrates through one side of the case, and a traction motor is installed at the position, behind the traction rolle