The invention discloses a self-adjustable mechanical cleaning scraping plate device. The device comprises a scraping plate device body. A cleaning device is arranged on one side of the inner end of the scraping plate device body, an adjusting device is rotationally connected to the side end of the cleaning device, and the adjusting device comprises an adjusting piece and a linkage piece. The adjusting piece is arranged on one side of the inner end of the adjusting device, and the linkage piece is rotationally connected to the side end of the adjusting piece. The adjusting piece comprises a penetrating frame, a limiting plate, a first shaft frame, a second shaft frame, a center frame, a rotating frame, a rotating disc, a threaded frame rod, a first driving shaft, a supporting plate, a firstmotor, a second motor, a conveying belt, a guide wheel, a second driving shaft, a matching disc and a third shaft frame, and the second motor is installed on one side of the inner end of the adjusting piece. According to the self-adjustable mechanical cleaning scraping plate device, the purpose of adjusting the inner end is achieved by arranging the adjusting device.