Recycling device for preparing combustible gas from activated carbon

The utility model provides an activated carbon combustible gas recycling device which comprises a carbonization furnace and an activation furnace, the carbonization furnace comprises a tar gas outlet, and the tar gas outlet is connected with a gas inlet of a gas mixing tank through a pipeline; the activation furnace comprises a flue gas outlet, the flue gas outlet is connected with a desulfurization and denitrification reaction device through a pipeline, a gas outlet of the desulfurization and denitrification reaction device is connected with a gas inlet of a carbon dioxide recovery device through a pipeline, and a gas outlet of the carbon dioxide recovery device is connected with a gas inlet of a gas mixing tank through a pipeline; a gas outlet of the gas mixing tank is connected with a gas inlet of the purification device through a pipeline, a gas outlet of the purification device is connected with a gas inlet of the methane synthesis tank through a pipeline, combustible gas generated in the carbonization f