The invention provides a carbon tank breathing connecting pipeline. The carbon tank breathing connecting pipeline comprises a first three-way valve, a first one-way valve, a second three-way valve, aVenturi tube and a second one-way valve; the inlet of the first three-way valve is connected to a carbon tank through a carbon tank electromagnetic valve and two outlets of the first three-way valve separately are connected to the inlet of the second three-way valve and the suction inlet of the Venturi tube; the first one-way valve is arranged between the first three-way valve and the second three-way valve; the first outlet of the second three-way valve is connected to a pipeline between an intake manifold and a throttle valve of an engine and the second outlet of the second three-way valve is connected the inlet of the Venturi tube; and the outlet of the Venturi tube is connected to a pre-pressure pipeline connected to a pressurizer and an air filter, and the second one-way valve is arranged between the outlet of the Venturi tube and the pre-pressure pipeline. The carbon tank breathing connecting pipeline provided by the invention can improve the suction effect of oil gas in the carbon tank by means of the carbon tank breathing system effectively. The invention also provides a carbon tank breathing connecting device.