The utility model discloses a corrosion-resistant and wear-resistant sealing ring for a water pump. The sealing ring comprises a first sealing ring body, a connecting ring, a second sealing ring body,an arc-shaped groove, a spring rod, an extrusion block, an elastic connecting body, an arc-shaped block, an elastic ball, a containing groove, a buffer block, a connecting rod, a fixing ring, a sliding block, a square groove, a telescopic spring, a trapezoidal block, a rolling wheel, a supporting rod and a sliding groove. Square grooves are uniformly formed in one side of the first sealing ring body; a fixing ring is mounted on the inner wall of the square groove; sliding blocks are fixed to the inner walls of the fixing rings through bolts. A connecting rod is arranged in the square groove;sliding grooves are correspondingly formed in the two sides of the connecting rod, the sliding grooves and the sliding blocks are of a matched structure, supporting rods are movably connected to the two sides of the connecting rod through hinges correspondingly, idler wheels are movably connected to the bottoms of the supporting rods through bearings, and telescopic springs are arranged on one sides of the supporting rods.