The application relates to the technical field of floor thickness detection, and particularly discloses a concrete floor thickness detection tool, which comprises a bottom plate, a detection mechanism arranged on the top of the bottom plate, and a troweling mechanism arranged on the top of the bottom plate and used for troweling the concrete surface; the detection mechanism comprises a transmission unit used for downhole detection of the concrete; the detection mechanism further comprises an auxiliary unit used for assisting the downhole detection; when the thickness of the concrete pouring floor is detected, the detection rod is rotated downward and deeply into the concrete for measurement by the transmission unit; compared with the mode of vertically inserting the detection rod under the general condition, the measurement of the rotated downward detection rod is more labor-saving, the concrete can be lifted up while the detection rod is rotated and deeply inserted downward, and compared with the vertical
insertion detection, the method of the rotated and deeply inserted detection can reduce the
extrusion of the concrete to the periphery.