Water conservancy pipeline pre-burying device and construction method of water conservancy pipeline pre-burying

The invention discloses a water conservancy pipeline pre-burying device and a construction method of water conservancy pipeline pre-burying, and belongs to the technical field of water conservancy construction. The water conservancy pipeline pre-burying device comprises a pit digging mechanism, wherein an unwinding mechanism is arranged at the front end of the pit digging mechanism, a soil conveying mechanism, a soil receiving hopper and a soil covering plate are sequentially arranged at the rear end of the pit digging mechanism, the pit digging mechanism comprises an excavator frame, a digging shovel is arranged in the middle of the excavator frame, and the upper ends of two movable connecting rods are hinged to the front portion and the rear portion of the excavator frame. A digging shovel in the pit digging mechanism can be driven by a driving motor to move in a reciprocating mode to complete pit digging operation, pipe arrangement is completed through the arranged unwinding mechanism, soil is conveyed to