The invention discloses a steel wire gauze sheet connecting machine used for coal mine protection. A control valve comprises a valve seat. A first annular groove and a second annular groove are sequentially formed in the periphery of the valve seat. A first air hole is formed in the first annular groove. A second air hole is formed in the second annular groove. A front valve cavity and a rear valve cavity are formed in the valve seat and communicate with each other through a reducing opening. The front valve cavity communicates with the first air hole and the second air hole. A third air hole is formed in the side wall of the rear valve cavity and communicates with an air inlet channel. A valve element and a switch reset spring are installed in the front valve cavity. The switch reset spring provides reset force for the valve element. An ejection rod is arranged on the valve element. A sealing ball is installed in the rear valve cavity. The diameter of the sealing ball is greater than the minimum diameter of the reducing opening. The ejection rod can push the sealing ball to be separated from the reducing opening. A metal button can be fast made on adjacent metal wires of two protective gauzes by holding the steel wire gauze sheet connecting machine with only one hand and pressing the control valve, and efficient wire connecting can be achieved by repeating the action.