The invention relates to a balcony wall-mounted solar water heater which comprises a bottom plate, an angle adjusting device, a solar water heater body and a fixed device. The angle adjusting device is mounted at the upper end of the bottom plate, the solar water heater body is mounted at the upper end of the angle adjusting device, and the fixed device is mounted at the rear end of the bottom plate. According to the balcony wall-mounted solar water heater, the problems that an existing solar water heater is hung on a balcony guardrail, manual operation is needed, the existing solar water heater cannot be mounted on the side of a balcony by a worker easily, consequently, the solar water heater is hung unstably, the solar water heater is prone to falling off in the strong wind weather, consequently, potential safety hazards are caused, a fixed mounting manner is adopted by most existing solar water heaters, heat collection pipes cannot receive sunlight to the largest extent, the utilization rate of the sunlight is reduced, consumed time is long, the labor intensity is large, and efficiency is low can be solved; and the functions of automatically hanging the solar water heater onto the balcony guardrail and adjusting the angle can be achieved.