Wall surface thickness detector

The utility model provides a wall thickness detector, which relates to the technical field of thickness detection and comprises a thickness detector body. The thickness gauge body is provided with an ultrasonic thickness gauge in the vertical direction, fixing threaded blind holes are formed in the middles of the upper end and the lower end of the rear end face of the ultrasonic thickness gauge, a locking threaded blind hole is formed in the middle of the top end face of the ultrasonic thickness gauge, and an anti-disengaging rubber strip in the vertical direction is installed in the middle of the rear end face of the ultrasonic thickness gauge through bolts. The upper end and the lower end of the anti-falling rubber strip are respectively provided with a semicircular head with a front-and-back through hole, so that the anti-falling rubber strip can be conveniently installed in the middle of the rear end face of the ultrasonic thickness gauge through a bolt, a hand can be conveniently inserted between the ult