The invention relates to a cabling rack device under a crane beam. The cabling rack device comprises the crane beam, a walkway plate on one side of the upper part of the crane beam, a power cabinet located on the upper part of the walkway plate, rib plates vertically arranged at intervals on the two sides of the middle part of the crane beam and I-shaped steel sliding contact lines horizontally arranged on the outer rib plates. The cabling rack device also comprises a transverse brace, a combined bracket, a bridge frame, an L-shaped frame, a well-shaped frame, a C-shaped frame and a transversebrace overlapping fixing frame. The L-shaped frame is provided with a first cable fixing support,. The well-shaped frame is provided with a second cable fixing support and a third cable fixing support. The C-shaped frame is provided with a fourth cable fixing support. The first cable fixing support and the second cable fixing support are the first cable routes between the cable bridge under the crane beam and the power cabinet on the crane beam walkway board. The third cable fixing support and the fourth cable fixing support are the second cable routes between the power cabinet on the crane beam walkway board and the power supply end of the sliding contact lines. The control of the quality main control indexes such as the level degree, the centrality degree and the like of the cable bridge is easy and the engineering installation quality is improved.