CVS valve assembly, carbon tank and vehicle

The invention discloses a CVS valve assembly, a carbon tank and a vehicle, the CVS valve assembly comprises a valve body, a first ventilation pipe and a locking mechanism, the first ventilation pipe is detachably located in a sleeve, the valve body communicates with the first ventilation pipe, the first ventilation pipe communicates between the valve body and a box body of the carbon tank, and the locking mechanism comprises a locking block, a first clamping ring and a second clamping ring; the locking block is provided with a first guide inclined surface; the second clamping ring is provided with a second guide inclined surface; in the first state, the first guide inclined face is used for guiding the first clamping ring to move so that the first clamping ring can smoothly move to the locking position of the locking block to be locked by the locking block, and in the second state, the second guide inclined face is used for guiding the second clamping ring and the first clamping ring to move relative to the l