The invention discloses a fuel tank of a hybrid electric vehicle. The fuel tank comprises a cooling tank body, a fuel pressure device is installed at the top of the cooling tank body, an automatic turning-off fuel pipe switch is arranged on one side of the fuel pressure device, a fuel filling port and a controller are arranged at the top of the automatic turning-off fuel pipe switch, a fuel pipe and a high-pressure-resistant rubber pipe are arranged at the bottom end of the fuel filling port, and an auxiliary fuel tank is installed at the bottom of the fuel pipe. An anti-static inner wall is adopted for the fuel tank of the hybrid electric vehicle, and therefore it is effectively prevented that during moving of the electric vehicle, static caused by friction inside the fuel tank leads to firing of the fuel tank; the automatic turning-off fuel pipe switch can be turned off during fuel filling and automatically turned on after fuel filling, and therefore dust and impurities are effectively prevented from entering the fuel tank; the fuel pressure device can effectively reflect fuel pressure inside the fuel tank and pressure intensity inside a special fuel treating tank, and a one-way fuel overflowing opening of the auxiliary fuel tank can effectively keep the auxiliary fuel tank in a full-oil state, and therefore the electric vehicle is driven for a long distance more easily.