Solar water heater

The invention discloses a solar water heater comprising a mounting base fixedly arranged in the outer wall of a building. A fixed bracket is fixedly arranged at the upper part of the right side of themounting base; and a solar photovoltaic panel is hinged to the right end of the fixed bracket. A first sliding groove is formed in the bottom in the inner wall of the mounting base; a first drive cavity is arranged at the left side of the first sliding groove in a communication manner; a first bevel gear is fixedly arranged in the first drive cavity; and a first threaded rod is fixedly arranged at the right end surface of the first bevel gear. The wall-mounted solar water heater only occupies a small area; the space of the outer wall of the building is used flexibly; the angle of the solar photovoltaic panel can be adjusted to realize efficient use of sunlight; and the solar photovoltaic panels can be adjusted to be perpendicular to the ground in severe weather, so that the damage of thesolar photovoltaic panel i