Water pipe connecting structure and water heater

The utility model belongs to the technical field of water heaters, and discloses a water pipe connecting structure and a water heater. The water pipe connecting structure comprises a plurality of first clamping jaws and a water retaining ring, the first clamping jaws are located on the periphery of the mounting hole of the cover plate, one end of each first clamping jaw is connected with the cover plate, and the other end of each first clamping jaw extends towards the mounting hole to form a pressing part; the water retaining ring is clamped between the cover plate and the pressing part, the water retaining ring can move in the radial direction relative to the mounting hole for position adjustment, and the water pipe can penetrate through the water retaining ring and the mounting hole. The water retaining ring can be radially and movably adjusted relative to the mounting hole, the water retaining ring is movably clamped between the cover plate and the abutting part and can be radially and movably adjusted rel