Pre-assembling rack for high-speed railway tunnel overhead line system channel

The utility model discloses a pre-assembling rack for a high-speed railway tunnel overhead line system channel. The pre-assembling rack comprises a plurality of supporting rods and a bearing frame arranged above the supporting rods, the bearing frame comprises symmetrically-arranged L-shaped plates and L-shaped blocks arranged at the two ends of the L-shaped plates, horizontal plate blocks of the L-shaped blocks are arranged on horizontal plate blocks of the L-shaped plates, the horizontal plate blocks of the two L-shaped blocks are oppositely arranged, a plurality of bearing plates are further arranged between the two L-shaped plates, and the bearing plates are arranged between the two L-shaped plates. The L-shaped block and the bearing plate are each provided with a limiting block set. The distance between the two channels can be positioned in advance, it is guaranteed that the two channels are in a parallel state, the installation precision of the channels is guaranteed, and the transportation efficiency i