The invention provides an automobile tubular part detection device comprising a rotatable telescopic rod. A fixing disc driving a tubular part to move and rotate is fixedly arranged on the telescopicrod; a detection disc is arranged above a detection stand and is provided with laser parts, photosensitive parts and a controller; the laser parts include section laser parts and a roundness laser part, wherein laser emitted by the section laser parts and the roundness laser part illuminates different directions; the photosensitive parts include section photosensitive parts and a roundness photosensitive part, wherein the connecting lines of installation positions of the photosensitive parts form a triangle; the photosensitive parts are used for receiving reflected laser; the controller is electrically connected with the laser parts and the photosensitive parts; the detection stand is also provide a marking rod which electrically connected with the controller. The problem that conventionaldetection devices cannot detect both the section and the overall roundness of tubular parts and cannot perform marking is solved.