The utility model discloses a thick controlling means of cast -in -place concrete slab. It includes: a flat board, an at least connecting rod, every connecting rod perpendicular to the flat board is arranged, and its upper end is fixed dull and stereotyped bottom surface, the tip is equipped with the external screw thread under it, the nut that quantity is the same with the connecting rod, the thread connection of every nut and connecting rod, the sleeve the same with the connecting rod with quantity, every sleeve adopts can change the length structure, and every sleeve movable sleeve is established on a connecting rod. The utility model discloses can improve floor gauge control precision, building surface evenness of form is good, just the utility model discloses simple structure, the processing preparation is convenient, and simple to operate is swift to repeatedly usable, low cost.