The invention discloses a full-automatic garbage classification treatment separation line and process. The separation line comprises a crusher, a water washing tank, a dryer, a smashing machine, a magnetic separator, a winnowing machine and a gasifier; the crusher is provided with two outlets, wherein one outlet is connected with the smashing machine and the magnetic separator in sequence, and the other outlet is connected with the water washing tank, the dryer, the winnowing machine and the gasifier in sequence; the magnetic separator is provided with two outlets, wherein one outlet can output coarse materials for producing fertilizers, and the other outlet can output fine materials for recovery; materials floating on the water surface in the water washing tank can be conveyed into the drying furnace, and the rest materials are filtered for fertilizer production; and the winnowing machine is provided with two outlets, wherein one outlet can output light materials for granulation, and the other outlet is connected with an inlet of the gasifier. The separation line has the beneficial effects of: capability of effectively recycling different components in garbage and reduction of energy consumption and pollution in the treatment process.