The invention discloses a decorative stone line bottom grinding dedusting and cleaning device. The decorative stone line bottom grinding dedusting and cleaning device includes a bottom seat. The interior of the bottom seat is provided with a second motor. A grinding disk is connected above the second motor. A grinding wheel is fixedly connected above the grinding disk. The exterior of the grindingwheel is provided with a main body. A limiting plate is connected below a bearing plate. The connecting device is internally provided with a first rotation shaft. A first dedusting disk is connectedbelow the first rotation shaft. A first brushing hair is connected above a second dedusting disk, and the second dedusting disk is internally provided with a sprinkler head. A dedusting device is arranged above the main body. A motor chamber is internally provided with a first motor. The two sides of the first motor are connected with water inlet pipes. The two sides of the dedusting device are provided with first guiding rails. According to the bottom grinding dedusting device used for man-made decorative stone line processing, works of bottom grinding and dedusting of the man-made decorativestone line can be achieved integratedly, the cost is saved, and the processing efficiency of the man-made decorative stone line is improved.