The invention discloses a device for detecting the rotation resistance of an automobile seat recliner, which comprises a base plate and is characterized in that one side of the base plate is provided with a side plate, the end part of the side plate is provided with a limiting plate, a locking bar is inserted in the limiting plate, the locking bar is connected with the limiting plate through a screw thread, the upper end of the locking bar is a free end, the lower end of the locking bar is provided with a locking piece, the locking piece is arranged between the limiting plate and the base plate, and the base plate is provided with a loading plate; and the loading plate is provided with a dynamometer. According to the invention, the locking piece can be controlled to lock one side of the automobile seat recliner, and a user can pull the other side of the automobile seat recliner through the dynamometer, thereby being convenient for detecting the rotation resistance of the automobile seat recliner.