Locking device of flexible water tank

The utility model relates to a locking device of a flexible water tank and belongs to the technical field of manufacturing of petroleum and natural gas fracture production increase devices. The locking device comprises a foldable hollow support. The foldable hollow support comprises at least two frames and a connecting rod set. The connecting rod set comprises two connecting rods which are hinged to each other. The two connecting rods are hinged to the two frames adjacent to the two connecting rods respectively, and the other end of each connecting rod is the sliding end. The sliding end of each connecting rod is arranged on the adjacent frame, a rotating shaft is arranged on at least one frame, and a clamping column is hinged to the rotating shaft. The minimum distance between the rotating shaft and the sliding end of one connecting rod is smaller than the length of the clamping column. A pull rod extends to the edge of the flexible water tank. According to the locking device of the flexible water tank, the