The proposed invention is an in-situ system for aerobic heat treatment of biodegradable organic waste, comprising a bioreactor made up of a dish-shaped decomposition chamber. The decomposition chamber has a lid at the top through which an air extraction device is connected. The air extraction device enables fresh air to enter the decomposition chamber and a preparation for a device supplies the biodegradable organic waste. The decomposition chamber is also connected to a system of pipes which convey a hot fluid from the supply tank into a plurality of minitubes located longitudinally on the inner perimeter of the decomposition chamber, and into a shaft that forms part of the mixing mechanism. A centrifugal pump conveys the same fluid, which is now “cold”, from inside the minitubes and shaft to a solar collector, to heat it, before delivering it to a storage tank for subsequent recirculation.