Reverse circulation device for pump suction reverse circulation drilling hole-forming cast-in-place pile

The utility model discloses a reverse circulation device for a pump suction reverse circulation drilling hole-forming cast-in-place pile, and belongs to the technical field of cast-in-place piles. The reverse circulation device comprises a rotary drilling machine, a reverse circulation gravel pump, a slag suction hose, a slurry purifier and a sedimentation tank which are communicated in sequence; a jet flow assembly is arranged between the sedimentation tank and the pile hole, the jet flow assembly comprises a connecting box and two arc-shaped boxes connected to the two sides of the connecting box, one end of each arc-shaped box communicates with the connecting box, and the other end of each arc-shaped box is detachably installed with the end of the other arc-shaped box; a sludge inlet pipe connected with the sedimentation tank is arranged on the connecting box; the arc-shaped box is arranged around the axis of the pile hole, and a plurality of mud spraying pipes evenly distributed in the arc-shaped extending