Mining roadway supporting device

The mining roadway supporting device comprises the top mechanism, the connecting mechanism, the supporting mechanism and the base mechanism, the width of the mining roadway supporting device is adjusted through stretching and retracting of the telescopic rod, and silt is prevented from entering the telescopic rod through the inner protection plate and the outer protection plate; the practicability and the adjustability of the mining roadway supporting device are improved; meanwhile, the lower portion of the connecting protruding block rotates to enter the movable end of the telescopic column, and the stability of the mining roadway supporting device is improved; in addition, the connecting groove body is connected with the supporting rod by pressing the outer surface of the supporting rod through the bolt, so that the mining roadway supporting device is easy to disassemble, the bolt is arranged in the fixing groove, the bolt is isolated from the outside through the sealing cover and the sealing piece, the bol