Progressively-warming type solar water heater

The utility model provides a progressively-warming type solar water heater and belongs to the technical field of solar water heaters. The progressively-warming type solar water heater is structurally characterized in that one heat collection pipe unit in a solar heat collection pipe set is composed of a water inlet pipe core and a heat collection pipe shell which are sleeved with each other, the water inlet pipe core penetrates through the side wall at the upper end of the heat collection pipe shell and extends into the heat collection pipe shell to the bottom end, the upper end of the heat collection pipe shell is connected with a water outlet branch pipe which is connected with the water inlet pipe core of a next heat collection pipe unit, and the connection passes on in sequence to form the heat collection pipe units. A tee pipe is arranged on the downstream of a water supply pipe and connected with the upstream end of the solar heat collection pipe set. The water outlet branch pipe at the downstream end o