The invention relates to an energy-saving and environment-friendly household garbage treatment device. The energy-saving and environment-friendly household garbage treatment device comprises a pulverizing chamber, a fermentation chamber, an incineration chamber and a slag chamber, all of which are connected in a closed manner from top to bottom. The energy-saving and environment-friendly household garbage treatment device further comprises a smoke treatment box, garbage is pulverized through the pulverizing chamber and then enters the fermentation chamber to be fermented and degraded, more marsh gas can be generated, one part of marsh gas can serve as energy of the incineration chamber, and the other part of marsh gas can be collected through a marsh gas tank. Smoke generated in the incineration process is purified through the smoke treatment box, and residues obtained after incineration can serve as fertilizer. The energy-saving and environment-friendly household garbage treatment device is used for treating family daily household garbage, secondary pollution cannot be caused, the demanded amount of outside energy is small, leachate, smoke and the residues can be treated, and the energy-saving and environment-friendly household garbage treatment device is very environment-friendly.