Three-soft coal seam uphill fully-mechanized excavation retaining wall supporting method and supporting device

The invention provides a three-soft coal seam uphill fully-mechanized excavating retaining wall supporting method and device, and the method comprises the following steps: S1, a fully-mechanized excavating machine carries out tunneling in a three-soft coal seam to form an upper step and a lower step, a roadway is supported and followed, and a U-shaped shed is erected in a tunneling roadway; s2, when the upper step is tunneled to a preset position, the fan-shaped protective net is fixed to the tunneling working face of the upper step through an anchoring assembly; and S3, the fully-mechanized excavating machine excavates a lower step in the excavating roadway, and when the lower step is excavated to a preset position, the rectangular protective net is fixed to the lower step through the anchoring assembly. The fan-shaped protective net and the rectangular protective net are fixed on the tunneling working faces of the upper step and the lower step of the three-soft coal seam through the anchoring assemblies res