The invention provides a method for detecting whether an automobile accessory is installed or not. The method comprises the steps of arranging a detection area, obtaining template information, takingan effective to-be-detected image, judging a to-be-detected object, judging the front face and the back face of the to-be-detected object, judging the to-be-detected accessory, judging whether the automobile accessory is installed in place, judging whether the automobile accessory is overturned or not and judging whether the automobile accessory is taken away. The invention also provides a devicefor realizing the method. The visual detection technology and the image processing technology are applied, the whole process from placement to accessory detection to taking out of the automobile backcushion can be accurately detected, and the detection precision and efficiency are improved.