Positive and negative pressure endurance testing tool for oil tank

The invention discloses a positive and negative pressure endurance testing tool for an oil tank, and the tool comprises an oil tank rack for placing an oil tank. A testing device is disposed beside the oil tank, and comprises an active air cylinder and a passive air cylinder, wherein the active and passive air cylinders are disposed on a support in the same direction in a parallel manner. The tops of movable rods of the two air cylinders are connected through a connecting block. A guide rod is arranged to be parallel to the two air cylinders between the two air cylinders. One end of the guide rod is disposed on the connecting block, and positions of travel switch contacts at the tail end of the active air cylinder on the guide rod is provided with a contact piece, and the two travel switches are connected with a counter. The passive air cylinder is connected with an air inlet of the oil tank, and an air outlet end, connected with the oil tank, of the passive air cylinder is provided with an air adjustment swi