Harmless treatment process for household garbage

The invention provides a harmless treatment process for household garbage. The harmless treatment process comprises the following steps that (1) water is drained off collected household garbage; (2) crushing, crushing separation and magnetic separation are performed on the household garbage, thus separating out foreign matter including plastic, stones, glass and shells in the household garbage andrecovering metal substances mixed into the household garbage; (3) the treated household garbage is placed into high-temperature and high-pressure equipment whose temperature is 100-120 DEG C, internal pressure is 0.4-0.5 Mpa and feeding hole caliber is more than 100mm for damp-heat hydrolysis, thus hydrolyzing organic materials while separating out animal and vegetable oil and fat in the household garbage; and (4) enough water is added into the household garbage subjected to damp-heat hydrolysis, and then the garbage is uniformly stirred and fed into a physical settling chamber through a current stabilizer. According