The invention relates to an offshore platform garbage processing apparatus capable of prolonging garbage storage time. According to the apparatus, a garbage processing bin is fixedly installed in a machine body, a crushing stirring motor and a reduction gearbox thereof are fixedly installed above the garbage processing bin; a transverse output end of the reduction gearbox is fixedly provided with a crushing shaft, and a longitudinal output end of the reduction gearbox is fixedly provided with a stirring rod; the bottom of the garbage processing bin is provided with a heating mechanism; oil-water steam generated after garbage is heated enters a condenser, smell of the steam enters a deodoring device via a high-pressure blower; and a material discharge port of the garbage processing bin is provided with a material discharge valve controlled by a linear speed reducer, and the bottom of the material discharge port is fixedly provided with a loading tray connected with a vacuum packaging machine. The apparatus automatically operates through control of an electric cabinet PLC. Garbage processed by the apparatus at rated time has the average weight reduction rate of 85% or more and the volume reduction rate of 85% or more. Garbage is cooled to normal temperature and is subjected to vacuum packaging, and the storage time is 30 days or more.