Back gum for coded lock

The utility model relates to the technical field of coded locks, in particular to gum for a coded lock, which comprises a foam layer, a polyester film is attached to the top surface of the foam layer, a release film is arranged on the bottom surface of the foam layer, and a layer of acrylate adhesive coated on the bottom surface of the foam layer is arranged between the foam layer and the release film. The foam layer is provided with two sensor mounting holes, at least two first positioning holes, a fingerprint identification mounting hole, a camera mounting hole, a key hole group located below the camera mounting hole, a second positioning hole located below the key hole group, and a knob mounting hole located below the second positioning hole. According to the present invention, the acrylate adhesive is adopted to replace the existing polyvinyl ether pressure-sensitive adhesive, such that the use amount of the volatile organic compound of the original adhesive and the emitted pungent odor are reduced by the