Leakage-proof mechanism for double-layer oil tank

The utility model relates to the technical field of double-layer oil tanks, and discloses a double-layer oil tank leakproof mechanism which comprises an outer tank and an inner tank assembly fixedly installed in the outer tank, a supporting mechanism is arranged at the bottom of the outer tank, a feeding mechanism and a vacuum pressure gauge are arranged on the outer tank, and an insulation box is fixedly installed on the upper side wall face of the outer tank. The wall faces of the outer tank and the inner pipe assembly are connected with connecting pipes in a sealed mode, matched movable rods are movably installed in the connecting pipes, and floating plates are fixedly installed at the bottoms of the movable rods. When the inner tank assembly leaks, the vacuum pressure gauge can display the pressure change to remind workers, in addition, along with reduction of the oil level in the inner tank assembly, the floating plate can move downwards, the movable rod can drive the metal copper bar to move downwards,