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The double-port exhaust valve is suitable for pipelines with water as a device to remove gas in the pipeline to improve the efficiency of water transmission equipment and protect the pipeline from deformation and rupture. When the water in the pipe begins to be injected, the plug head stays in the open position, a large amount of exhaust is carried out, when the air is discharged, the water in the valve accumulates, the float is floated, the plug head is driven to the closed position, stop a large amount of exhaust, when the water in the pipe is transported normally, if a small amount of air is collected in the valve to a considerable extent, the water level in the valve drops, and the float ball falls, at this time the air is discharged from the small hole, when the pumping machine stops, the water in the pipe is empty or when negative pressure is generated in the pipe, the plug head is quickly opened to suck in air to ensure that the pipeline is complete.