This portable oil tank uses double faces hot galvanized steel plate as material with surface coated and it has strong ability of corrosion and rust resistance and vibration and explosion resistance. In addition it is equipped with liquid shaking proof equipment and make the oil tank more safe and reliable in carrying. The attached accessories include expansion pipe and it can change the length and bending level during oiling and makes the oiling more convenient. This oil tank is equipped with three specifications: 5L、10L、20L and it can store various kinds of fuel oil it is convenient to carry. It is applicable in the fuel oil supplement and storage in outdoor operation fuel dynamic tool and other small type of fuel motor.