The invention relates to the field of mechanical pneumatic control, in particular to a two-way pneumatic control valve. The technical problems that as for an existing pneumatic control valve, liquid is prone to flowing back, the pneumatic control valve cannot be closed tightly, and consequently, the function gets out of control are solved. The two-way pneumatic control valve comprises a shell provided with a liquid inlet and a liquid outlet, a jacking rod arranged in the shell, and a valve element matched with the jacking rod and used for opening and closing the liquid inlet; the front end ofthe valve element is used for opening and closing the liquid inlet, a cavity is formed between the tail end of the valve element and the shell, and the shell is provided with a first control gas inletwhich communicates with the cavity formed by the tail end of the valve element and the shell; the tail end of the valve element is connected with a valve rod, the tail end of the valve rod is slidably limited to the shell, and the valve rod is sleeved with a return spring; and the shell is further provided with a second control gas inlet used for inputting external gas for controlling action of the jacking rod. The structure of a valve communicating the inlet with the outlet is improved, a path is opened or closed by adopting a control gas driving mode, and the problem of possible backflow issolved.