A wireless transmission apparatus includes an electrically insulative housing, metal conducting terminals vertically arranged at the rear side of the electrically insulative housing and having one respective front contact portion respectively horizontally extended to the bottom wall of an accommodation chamber in the electrically insulative housing, and a transmission module, which includes a circuit assembly accommodated in the accommodation chamber of the electrically insulative housing and metal adapter terminals each having a bonding end vertically disposed at the rear side and respectively bonded to the circuit assembly and a springy contact end horizontally disposed at the front side and kept in positive contact with the front contact portion of one respective metal conducting terminal.