Supporting structure in foundation pit

The utility model relates to a foundation pit inner supporting structure and belongs to the technical field of building construction, the foundation pit inner supporting structure comprises a supporting pile, a supporting sleeve, an anchor cable pipe, a clamping assembly and a driving assembly, the supporting sleeve is inserted into the supporting pile, the anchor cable pipe is arranged in the supporting sleeve in a penetrating mode, the clamping assembly comprises a first clamping ring and a second clamping ring, and the driving assembly comprises a driving gear and a transmission gear. A base is arranged on the supporting pile, the driving gear and the transmission gear are both rotationally arranged on the side, facing a pipe opening of the supporting sleeve, of the base, the transmission gear is meshed with the driving gear, the first clamping ring is connected with the driving gear, the second clamping ring is connected with the transmission gear, and the inner wall of the first clamping ring and the inn