The invention discloses a resetting and fixing device for severe spondylolisthesis, and relates to the technical field of resetting and fixing devices for spondylolisthesis. The present invention includes two fixing units arranged side by side, each fixing unit includes a connecting rod body and at least three pedicle screws, the connecting rod body is installed on the pedicle screws, and the fixing unit also includes a connector, which penetrates through the pedicle screw. There are a first through hole and a second through hole, and the connector is also provided with a first threaded hole communicating with the first through hole, a second threaded hole communicating with the second through hole, the first threaded hole and the second threaded hole A fixing screw is arranged in the hole, and the connecting rod body includes a first connecting rod passing through the first through hole and a second connecting rod passing through the second through hole.