Fuel tank cap and vehicle

The utility model relates to a fuel tank cap and a vehicle. The fuel tank cap comprises a main body assembly used for being connected with a fuel tank to seal the fuel tank; the cover body assembly is connected with the main body assembly; the transmission assembly is located between the main body assembly and the cover body assembly and connected with at least one of the main body assembly and the cover body assembly, and the transmission assembly can move under the action of the internal pressure of the oil tank; the cover body assembly is provided with a display area, and the display area is used for representing the movement displacement of the transmission assembly. According to the fuel tank cap, the display area is arranged on the cap body assembly, so that a user can directly observe the motion state of the transmission assembly through the display area to judge the internal pressure of the fuel tank, and the internal pressure of the fuel tank can be visualized through the fuel tank cap. 本申请涉及一种油箱盖及车辆