Abstract: A waterproof stereo cover assembly includes a stereo-mounting frame for mounting a stereo therein, a waterproof cover pivotally attached to the stereo-mounting frame, and sealing members mounted in the stereo-mounting frame for sealing the stereo-mounting frame. The stereo-mounting frame has a notch formed on and extending lengthwise along an upper frame thereof, defining two end walls. A polygonal socket is symmetrically formed in each of the two end walls of the notch. A slot having a width slightly less than that of the polygonal socket extends from each polygonal socket to a front side of the stereo-mounting frame. The waterproof cover has a flange extending on an upper edge thereof, being received in the notch.