The invention discloses a solid-liquid-gas three-state cooperative garbage pyrolysis treatment system. The system comprises a garbage treatment furnace, a draining device, an air blower, a first draught fan, a second draught fan, a gas purifying mechanism and a slag recycling mechanism. In the system, a combustion point is directly covered by garbage so that open fire can not appear in a garbage treatment furnace, and safety of garbage treatment is improved. Besides, a negative-pressure environment is maintained in the garbage treatment furnace, and explosive risks caused after flammable and combustible garbage is combusted can also be avoided. In the system, after the garbage starts to be combusted, fuel does not need to be supplemented, the garbage treatment furnace does not need to subjected to anti-explosion treatment, and cost is reduced easily.