Exhaust valve, oil tank system and vehicle

The invention discloses an exhaust valve, an oil tank system and a vehicle, and relates to the technical field of oil tanks, and the exhaust valve comprises a valve body, a first valve element and a second valve element. Wherein a first chamber and a second chamber which are communicated with each other are arranged in the valve body, the first chamber is provided with an exhaust port communicated with the outside of the oil tank, and the second chamber is provided with an air inlet communicated with the inside of the oil tank. The first valve element is arranged in the first cavity, and the first valve element is provided with a first communicating position for communicating the exhaust port with the second cavity and a first sealing position for separating the exhaust port from the second cavity. The second valve element is arranged in the second cavity, and the second valve element is provided with a second communicating position for communicating the air inlet with the first cavity and a second sealing position for separating the air inlet from the first cavity. According to the exhaust valve, the two valve elements can be integrated on one valve body, and the structure of the exhaust valve is simplified.