The invention discloses a system and method for processing household garbage. The system comprises a pretreatment device, a heat storage type radiating pipe rotary bed and a cement kiln cooperative processing unit. The pretreatment device is provided with a household garbage inlet, an odor outlet, an organic garbage outlet, an inorganic garbage outlet and a first sewage outlet. The heat storage type radiating pipe rotary bed is provided with a first flammable gas inlet, a combustion air inlet, an organic garbage inlet, a pyrolysis oil-gas outlet and a pyrolysis carbon outlet. The combustion air inlet is connected with the odor outlet. The organic garbage inlet is connected with the organic garbage outlet. The cement kiln cooperative processing unit is provided with a raw material inlet, a fuel inlet, a waste gas outlet and a cement outlet. The fuel inlet is connected with the pyrolysis carbon outlet. By means of the system, the cement production cost can be effectively reduced, harmless treatment and resourceful treatment of household garbage can be achieved, and giant economic benefits and social benefits are gained.