The present invention relates to the technical field of pyrolysis technology, and specifically discloses a compact domestic waste pyrolysis apparatus featuring an integrated multi-chamber secondary combustion chamber. The apparatus consists of a pyrolysis furnace, which incorporates both a pyrolysis chamber and a secondary combustion chamber. The upper section of the pyrolysis chamber is provided with a communication hole that connects to the secondary combustion chamber. In this apparatus, the pyrolysis chamber and the secondary combustion chamber are closely integrated. The generated pyrolytic gas directly enters the secondary combustion chamber, effectively preventing coking and significantly reducing the frequency of failures. The secondary combustion chamber absorbs radiant heat from the pyrolysis chamber, maintaining its temperature consistently above 850 C., which is conducive to the complete combustion of the pyrolytic gas and maximizes thermal energy release. This promotes the complete decomposition of dioxin precursors, reduces the likelihood of dioxin reformation, lowers the initial emission concentration of dioxins, and decreases the required dosage of adsorbent activated carbon. The highly integrated design of the secondary combustion chamber and the pyrolysis chamber optimizes space utilization and reduces the equipment's footprint, thereby lowering investment and construction costs.