Leakage-proof device of cooler

The utility model relates to the technical field of coolers, and discloses a leakproof device of a cooler, which comprises a barrel, a left connecting plate is arranged on the surface of one end of the barrel, the barrel is fixedly connected with the left connecting plate, and a left connector is arranged at one end, close to the left connecting plate, of the barrel. A first connecting plate is arranged on the surface of the end, close to the cylinder body, of the left side connector, a protective clamping groove is formed in the end, close to the first connecting plate, of the left side connecting plate, a first sealing ring is arranged in the protective clamping groove, and a first convex ejection block is arranged at one end of the first sealing ring; and the first convex top block is arranged in the protection clamping groove and is movably clamped, the outer wall of the first convex top block is provided with a first side face leakage-proof ring, multi-layer protection is conducted on the connecting posi