The invention relates to a column hoop, a column hoop device and a construction method of the column hoop device. The column hoop comprises a first web plate, a second web plate, a first edge part, asecond edge part, a third edge part and a fourth edge part, wherein the second web plate and the first web plate are perpendicularly connected with each other, and the second web plate and the first web plate are integrally formed; a section, far from the second web plate, of the first web plate is provided with a first limiting hole, a section, far from the first web plate, of the second web plate is provided with a second limiting hole; the first edge part and the second edge part are respectively and perpendicularly connected with two opposite edges of the first web plate, the third edge part and the fourth edge part are receptively and perpendicularly connected with two opposite edges of the second web plate; the third edge part and the first edge part are perpendicularly connected with each other, and the fourth edge part and the second edge part are perpendicularly connected with each other. According to the column hoop, not only is the rigidity of the column hoop improved, but also the column hoop can be stressed more reasonably and evenly; the column hoop can be repeatedly used, so that the repeated use rate is improved.