Building scaffold pedal extending and supporting device

The invention belongs to the technical field of building scaffolds, and particularly relates to a building scaffold pedal extending and supporting device which comprises a movable base, a lifting frame installed on the surface of the movable base, a pedal installed on the top of the lifting frame and an extending assembly installed on one side of the pedal. The extension pedal can slide out of the pedal to the required length according to the actual use requirement, the stability of the extension pedal is improved by matching with the self-locking performance of the worm gear and the worm, the use safety of the pedal is improved, the sliding rod connected in the fixing pipe in a sliding mode is used for hanging and supporting the sliding lifting rope, and the use safety of the pedal is improved. And the situation that the extended extending pedal is broken under the action of gravity is avoided, the safety and reliability in the using process are improved, pressure is applied to the second wedge-shaped block,