This invention is to provide an assembly module comprising a board, a frame disposed on a surface of the board, and a circuit board disposed on another surface of the board, wherein the circuit board includes a power line and an image transmission line for directly connecting to a camera power line and a video cable of a surveillance camera respectively. A hollow padding is added into a wire passing hole disposed in the board, and a size of the hollow padding may be adjusted according to the width of a wire of the surveillance camera, which passes through the hollow padding. Therefore, problems such as needing to make enough space in a wall or a ceiling for receiving a video transmitter, requiring an additional device for connecting to power supply, and having gaps being left between the wire and the wire passing hole may be resolved simultaneously.