Cast-in-place hollow floor box anti-floating device

The utility model discloses an anti-floating device for a cast-in-place hollow floor box, which belongs to the technical field of anti-floating devices and comprises a connecting piece, first telescopic grooves are fixedly connected to two sides of the connecting piece, second telescopic grooves are slidably connected into the first telescopic grooves, telescopic plates are slidably connected into the second telescopic grooves, and the telescopic plates are fixedly connected into the connecting piece. A clamping plate is fixedly connected to one side of the telescopic plate; through a first telescopic groove, a second telescopic groove and a telescopic plate, the second telescopic groove slides in the first telescopic groove, and the telescopic plate slides in the second telescopic groove, so that the arm length of the whole device can be freely adjusted according to the body type of the hollow floor slab, the practicability of the device is improved, meanwhile, the arm length of the whole device can be short