Roadway supporting device for coal mine and using method of roadway supporting device

The invention provides a roadway supporting device for a coal mine and a using method thereof. The roadway supporting device for the coal mine comprises stand columns and domes, the multiple stand columns are arranged and separated into two sets, and the domes are arranged above the stand columns; the first buckle plate is fixedly mounted at the bottom of the dome; the second buckle plates are fixedly installed on the tops of the multiple stand columns in the same group, and the second buckle plates and the first buckle plates are buckled and fixed through first bolts; the supporting seat plates are fixedly mounted at the bottoms of the vertical columns in the same group; and the hydraulic cylinders are detachably mounted at the bottom of the supporting seat plate through a dismounting mechanism, and the number of the hydraulic cylinders is multiple. The roadway supporting device for the coal mine and the using method of the roadway supporting device have the advantages that the supporting height can be adjus