The invention provides a fuel tank, and relates to the technical field of a vehicle. The fuel tank comprises a tank body and a first bracket, a transverse chamber is formed in the tank body, and at least one end of the transverse chamber is open; the first bracket can inserted into the transverse chamber and is detachably and fixedly connected with the tank body; and the first bracket can be fixedly connected with a corresponding vehicle body, and the fuel tank is mounted on the vehicle body. The fuel tank alleviates the problem that the volume of the fuel tank of a methanol commercial vehicleis relatively large in the prior art, so that a relative long time needs to be spent on filling the empty fuel tank or filling the fuel tank with less methanol fuel.