The present disclosure provides a holder of a vehicle-mounted camera, a manufacturing method and a mounting method. The holder of the vehicle-mounted comprises: an aligning part, a position of which is determined based on a position of a lens of the camera such that the lens is centered in the opening; and a fastener for fixing the holder of the vehicle-mounted camera to the body. The position of the aligning part is determined based on the position of the lens of the vehicle-mounted camera, thereby ensuring that the lens of the camera assembly is evenly spaced apart relative to the opening of the body of the vehicle, and improving aesthetics.