Deep foundation pit backfilling and tamping device

The invention is suitable for the technical field of foundation pit backfilling, and provides a deep foundation pit backfilling and tamping device which comprises a foundation pit body, a continuous tamping mechanism is arranged at the top of a positioning column, a balancing weight is installed at the bottom of the movable end of the continuous tamping mechanism, and one end of an elastic swing mechanism abuts against the inner wall of the foundation pit body. Soil for backfilling falls on the elastic swing mechanism when falling downwards along the foundation pit body, when the elastic swing mechanism is subjected to the weight of the soil, the tooth end of the elastic swing mechanism pushes the soil spreading mechanism to rotate and poke piled soil, the self-adaptive abutting mechanism is installed on the base plate, and the horizontal guide mechanism is installed on the self-adaptive abutting mechanism. When the self-adaptive abutting mechanism does circular motion, the balancing weight horizontally moves