Exhaust and water-saving toilet stool

The invention relates to an exhaust and water-saving toilet stool which comprises a toilet stool body, wherein the toilet stool body is connected with a gas collection cavity and an excrement collection pipe by an excrement collection pan; the gas collection cavity is communicated with an exhaust pipe; odor generated during defecation is collected by the gas collection cavity to the exhaust pipe and then exhausted to outdoors; an upper cover of the toilet stool is opened and a stopper is removed before the defecation; feces and urine are collected by the excrement collection pan to the excrement collection pipe; an electric gas check valve is arranged at the lower part of the excrement collection pipe; the excrement collection pipe is communicated with an excrement collection header; when the electric gas check valve is open, the feces and urine are discharged into the excrement collection header and then collected to an excrement collection pool to serve as organic fertilizer; after the defecation, the excrement collection pan, the excrement collection pipe and the electric gas check valve are brushed and flushed by a water spray brush; siphon drainage is replaced by brushing and flushing, so that flushing water is saved greatly; after the flushing, the electric gas check valve is closed; the excrement collection pipe is corked by the stopper; the upper cover covers the toilet stool; and the whole defecation process is accomplished.