Coating adhesion testing device

The utility model discloses a coating adhesion testing device, which comprises a box body, wherein a partition plate arranged in the box body divides the box body into an upper water tank and a lower water tank, wherein a water inlet is formed on the upper water tank; a constant temperature heating device is arranged at the interior of the upper water tank; an ultrasonic generator and an ultrasonic transducer are arranged in the lower water tank; a testing port is formed on the lateral wall of the lower water tank; and the lower part of the upper water tank and the lower water tank are communicated through a water inlet pipe arranged therebetween and provided with a water inlet valve. The coating adhesion testing device with simplicity in operation and accuracy in data test can be used for testing coating adhesion only by recording the time taken by a coating in a set area completely falling off.