Double-layer oil tank

The utility model provides a double-layer oil tank. A tank body of the double-layer oil tank is formed by a tank wall. The tank wall comprises an outer layer tank wall, an internal coating, a three dimensional fabric layer, a glass reinforced plastic layer, an antiseep layer and a conducting layer all of which are placed from outside to inside. The internal coating is placed on the inner surface of the outer layer tank wall, the three dimensional fabric layer with an interlayer space is arranged on the internal coating, the glass reinforced plastic layer is placed on the three dimensional fabric layer, the antiseep layer is arranged on the glass reinforced plastic layer, and the conducting layer is placed on the antiseep layer. The double-layer oil tank is provided with the interlayer space and is improved on the basis of an existing single layer wall storage tank, so that a leakage-monitoring system is provided with an installation space, and improvement cost is reduced.