The invention relates to an invisible self-adjustable general probe for an automobile. A probe mounting hole is formed in a bumper; connecting blocks are fixed on the inner side face of the bumper; a casing is in threaded connection with the connecting block; the casing is a cylindrical casing; threads are arranged on the outer circumference of the cylindrical wall of the cylindrical casing; the casing and the connecting blocks are connected through threads; grooves are formed in the axial direction of the cylindrical wall; a helical coil is arranged between each connecting block and the bottom of the corresponding groove; each helical coil is connected with an expansion bracket through the threads; the front end of the expansion bracket is connected with a probe bracket through a universal ball; a probe is arranged in the probe bracket; a protective casing is arranged outside the probe bracket; the probe bracket and the protective casing are connected by a connecting ring. After the invisible self-adjustable general probe disclosed by the invention is arranged on the automobile bumper, the invisible self-adjustable general probe can be flush with the plane of the bumper, so that the appearance of the automobile can be kept attractive; the size of outer diameter of the probe can be regulated according to the aperture size of the probe mounting hole in the bumper, so that the generality of the probe is guaranteed; the probe is retractable and is adjustable in angle; the distance and the angle which can be detected by the probe can be adjusted.