Back-of-ear hearing aid with waterproof sound inlet hole

The utility model relates to the technical field of hearing aids, in particular to a back-of-ear hearing aid with a waterproof sound inlet hole, which comprises a shell I and a shell II, the shell I and the shell II are connected in a buckling manner, inner shells are arranged in the shell I and the shell II, a front sound inlet hole and a rear sound inlet hole are symmetrically arranged on two sides of the shell II, and the front sound inlet hole and the rear sound inlet hole are communicated with the shell I and the shell II. Waterproof holes are formed in the positions, corresponding to the front sound inlet hole and the rear sound inlet hole, of the two sides of the inner shell, nanometer waterproof paper is arranged in the waterproof holes, and waterproof rubber rings are arranged in the waterproof holes and located above the nanometer waterproof paper. According to the utility model, sweat is prevented from entering the interior through the nanometer waterproof paper, sweat is prevented from entering th