A solar hot water tank is composed of a water tank body, glass, stainless steel strips, a small batten, a water tank support, a water tank water return pipe, a water-supplementing box, a water overflowing pipe, a hot water pipe, a tapping water pipe, an electromagnetic water-adding valve, a temperature adjusting valve, a bathing sprayer, a triangular supporting leg and a sensor. The solar hot water tank is characterized in that the hot water tank body is made of Chinese fir boards, strapped with the stainless steel strips and coated with varnish inside and outside, the small batten is installed inside the water tank body, and the deep-color glass is fixedly pasted by nail-free glue or glass cement; the water tank support is placed on a roof or a flat top roof, the water returning pipe is installed upwards on the water tank body, the water tank body is connected with the water-supplementing tank, and the water overflowing pipe and the water level sensor are arranged on the upper portion of the water-supplementing box; the upper end of the hot water pipe is connected with the wood water tank body, and the lower end of the hot water pipe is connected with the temperature adjusting valve and the hot water pipe; the electromagnetic water-adding valve is connected in series between the hot water pipe and the tapping water pipe, the width of the wood water tank body is three times that of the height of the wood water tank body, and the length is calculated according to needed volume. The hot water tank is easy to manufacture, low in manufacturing cost and suitable for farmers, pasturing areas, construction sites and other places.