Constant-temperature self-cleaning air energy water heater

The utility model provides a constant-temperature self-cleaning air energy water heater, and belongs to the field of water heater equipment. Comprising a heat pump unit and a heat preservation water tank, the heat pump unit is connected with the heat preservation water tank through a pipeline, a partition plate is fixed to the inner wall of the heat preservation water tank, a heating box is fixed to the bottom of the partition plate, a filter box is arranged on the partition plate, a through hole is formed in one side of the partition plate, and a hole is formed in the top of the heating box; a baffle is fixed to the top of the partition plate, an adsorption box is arranged between the baffle and the inner wall of the heat preservation water tank, a cationic resin filter element is arranged in the adsorption box, and a water passing hole is formed in the other side of the partition plate. Impurities in a water body can be effectively filtered through the filter box, calcium and magnesium ions contained in the