The utility model relates to a wireless belt off tracking sensor especially relates to the sensor field, and the purpose provides a wireless belt off tracking sensor, utilizes up -to -date style radio transmission technology, and information is fed back to direct measurement belt off tracking degree, including casing, wireless transmission device, battery and micro -gap switch, the casing is connected with first sensor driving lever and second sensor driving lever, and the inside micro -gap switch of casing is connected respectively to first sensor driving lever and second sensor driving lever tail end, and micro -gap switch passes through the wire and connects wireless transmission device, the wireless device fixed connection casing, and the wired connection has been saved in such design, and the experiment of being convenient for increases equipment reliability of protection, and the stability of equipment inspection has also been guaranteed in the design of dual sensor driving lever.