Building energy comprehensive utilization method

The invention provides a building energy comprehensive utilization method and belongs to the technical field of energy comprehensive utilization. An energy comprehensive utilization device of a building comprises a water storage barrel. A water pump box and a booster pump box are fixed at left and right ends of the water storage barrel; the water pump box is positioned above the booster pump box;a water pump is arranged in the water pump box; one ends of two water pump connecting pipes are fixed at a lower end of the water pump; an inner connecting pipe is fixed at a right end of the water pump; the inner connecting pipe penetrates through an inner wall of the water storage barrel and extends into the water storage barrel; external thread joints are arranged at the other ends of the two water pump connecting pipes; the two external thread joints are connected with a wastewater filtering mechanism through connecting pipes; a booster pump is arranged in the booster pump box; and a threaded connection hole is fi