The invention relates to the technical field of lift platforms for buildings, and discloses a platform for a building lift. The platform for the building lift includes a base, moving wheels, a liftingmechanism, a platform body, a protective guard, supporting columns, reinforcement blocks, an adjustment device, a shielding plate, limiting blocks, a rotating drum, a tool storage box and hooks. Themoving wheels are movably mounted on both sides of the bottom of the base, and the lifting mechanism is mounted on the upper surface of the base. According to the platform for the building lift, through the adjustment device, the telescopic movement of a first electric telescopic rod drives a movable plate to swing laterally, and the telescopic movement of a second electric telescopic rod drives the movable plate to swing longitudinally so as to realize the swing of the shielding plate in the front, rear, left and right directions. Heat stroke or severe physical discomforts can be caused to operators working at heights under the intense irradiation of the sun, and the platform can adjust the inclined direction of the shielding plate to maximize the shading area and provide a higher shady space, so that the efficiency of aerial operation of the operators is improved.