Concrete thickness detector

The utility model discloses a concrete thickness detector in the field of building measuring tools, which comprises a solid rod, an adjustable sliding sleeve, a horizontal bubble calibrator and a laser sighting device, the adjustable sliding sleeve is sleeved on the solid rod, and the horizontal bubble calibrator and the laser sighting device are arranged on two sides of the adjustable sliding sleeve. The laser sighting device comprises a horizontal laser sighting device and a vertical distance measuring sighting device, the horizontal laser sighting device is used for contrasting a reference value, and the vertical distance measuring sighting device is used for measuring the distance to the top of the concrete layer. The thickness of the concrete can be obtained by subtracting the measured distance from a reference value, and the horizontal laser sighting device can further determine that the solid rod is inserted into the bottom of the concrete layer by emitting laser to be compared with an external referen