NOVELTY - Water electrolysis hydrogen and oxygen gas-liquid separation control device comprises selective catalytic reduction unit, water electrolyzer, hydrogen/alkaline liquid separation comprehensive tower, oxygen/alkaline liquid separation comprehensive tower, oxygen diffuser, oxygen tower, drying tower, alkaline liquid circulating pump, and alkaline liquid supplementing control valve. The hydrogen/alkaline liquid separation comprehensive tower and oxygen/alkaline liquid separation comprehensive tower are provided with liquid level transmitters, each connected with programmable logic controller (PLC) device.    USE - Water electrolysis hydrogen and oxygen gas-liquid separation control device.    ADVANTAGE - The device avoids the mixing of hydrogen and oxygen in electrolytic cell.    DETAILED DESCRIPTION - Water electrolysis hydrogen and oxygen gas-liquid separation control device comprises a selective catalytic reduction unit, water electrolyzer, hydrogen/alkaline liquid separation comprehensive tower, oxygen/alkaline liquid separation comprehensive tower, oxygen diffuser, oxygen tower, drying tower, alkaline liquid circulating pump, and alkaline liquid supplementing control valve. The selective catalytic reduction unit is electrically connected with water electrolyzer, where water electrolysis grooves are connected with hydrogen/alkaline liquid separation comprehensive tower and oxygen/alkaline liquid separation comprehensive tower. The hydrogen/alkaline liquid separation comprehensive tower is connected with oxygen tower and alkaline liquid circulating pump through pipeline. The oxygen tower is connected with the drying tower through pipeline. The alkaline liquid circulating pump has input pipeline, which is provided with alkaline liquid replenishment control valve. The oxygen/alkaline liquid separation comprehensive tower is provided with oxygen diffuser. The oxygen/alkaline liquid separation comprehensive tower is connected with alkaline liquid circulating pump through pipeline. The hydrogen/alkaline liquid separation comprehensive tower and oxygen/alkaline liquid separation comprehensive tower are provided with liquid level transmitters, each connected with PLC device, which is connected with selective catalytic reduction unit.