The invention belongs to the technical field of environmental sanitation facilities and relates to a pit toilet with a function of converting excrement into sterile and odorless organic fertilizers. The technical scheme includes that the pit toilet comprises a source separation toilet, a urine treatment bag and a feces treatment bag and is characterized in that the source separation toilet consists of a urinal and a closet pan, the urinal is connected with the urine treatment bag, a urine port of the closet pan is communicated with the urinal, and the closet pan is connected with the feces treatment bag. A wind power flusher, a reactant adding device and a gas discharging pipe are mounted on the feces treatment bag, the urine treatment bag is connected onto a urine bag frame, and the feces treatment bag is connected onto a feces bag frame. The pit toilet has the advantages that health protection is realized due to harmless treatment of excrement; water flushing is avoided so as to adapt to a current situation of lack of sewers in rural areas; the feces bag is integrally taken out after thorough decomposition and drying of feces, so that pollution is avoided; by adoption of the feces bag and the urine bag, construction cost of the toilet can be reduced. Construction of novel ecological pit toilets is an important content of new countryside construction, and accordingly the pit toilet with the function of converting the excrement into the sterile and odorless organic fertilizers is in strong demand and pretty promising in market prospect.