Quick lengthening device for casing pipe of mechanical hole-forming cast-in-place pile

The utility model discloses a mechanical hole-forming cast-in-place pile casing pipe rapid lengthening device which comprises a first casing pipe and a second casing pipe inserted and connected to the top of the first casing pipe in the length direction, and a first clamping groove is formed in the top of the first casing pipe in the length direction. The first clamping groove comprises a first vertical inserting opening formed in the axial direction of the first sleeve and a first transverse inserting opening formed in the radial direction of the first sleeve and perpendicular to the first vertical inserting opening, the end, close to the first sleeve, of the second sleeve is fixedly connected with a first clamping block corresponding to the first clamping groove, and the first clamping block is fixedly clamped to the first clamping groove. One end, far away from the first sleeve, of the second sleeve is inserted and connected with a rotating mechanism which is used for driving the first clamping block to ro