Tank car roll protection device

The utility model discloses a tank car roll protection device which comprises two protection shells, through grooves are formed in the two protection shells, a supporting cylinder is fixedly connected between the two sides of the inner wall of each through groove, and heat dissipation grooves are formed in the sides, close to each other, of the two protection shells. An upper water tank is fixedly connected to the bottoms of the two protective shells jointly, two water bins are formed in the upper water tank, a lower water tank is fixedly connected to the bottom of the upper water tank, the centers of the two water bins communicate with the lower water tank through a three-way pipe, and pressure valves are fixedly connected to the two ends of the top of the three-way pipe correspondingly; a plurality of partition plates are fixedly connected to the bottom in the lower water tank. The upper water tank, the lower water tank and the pressure valve are matched with one another, so that water in the upper water ta