Solar device applied to pitched roof

The invention relates to a solar device applied to a pitched roof. In the solar device applied to the pitched roof, ventilation adjustment pipes are attached to a water tank; one ends of the adjustment pipes penetrate through a protective cover to communicate with the outside, and the other ends of the adjustment pipes are connected with inner cavities of side supporting pipes through first adjusting valves; when the temperature the first adjusting valves reaches the set temperature and is opened, the ventilation adjustment pipes communicate with the inner cavities of the side supporting pipes. The air in the ventilation adjustment pipes is heated to expand to flow to the outside from an outlet of the protective cover. Openings of the lower end of the side supporting pipes are located in alow place, the air temperature is low, and the air is sucked into the side supporting pipes to form the chimney effect. Excess heat generated in the water tank is taken away to a certain extent. Whenthe temperature of the wa