The invention discloses a frame ladder for building decoration. The frame ladder for building decoration comprises a ladder, a hinge mechanism for changing the opening angle of the frame ladder, pedals, a frame ladder balance mechanism and a center of gravity fine-adjusting mechanism, wherein the bottom of the hinge mechanism is hinged to the top of the ladder; the pedals are installed on the sideface of the ladder through bolts at equal distances, and the frame ladder balance mechanism is arranged at the bottom of the ladder; and the center of gravity fine-adjusting mechanism is arranged atthe center of the ladder. According to the frame ladder for the building decoration, the ladder pedals can adjust the friction force and the inclination angle adaptively. According to the foot shape of an operator and the operator weight, the corresponding change and fit can be made, and on the one hand, the friction force between the pedals and construction personnel is increased, and the slippage is avoided; and on the other hand, the construction personnel feet is driven to perform a minor angle change, then according to the construction personnel weight, the body center of gravity is properly changed, the stability and safety of the construction personnel standing on the frame ladder are improved, and meanwhile, the waste of more construction time for the adjustment of the frame ladderis avoided.