The utility model provides a gas injection pipe column for top-to-bottom layer-by-layer fire flooding. The gas injection pipe column comprises an outer pipe column and an inner pipe column placed in the outer pipe column, and an inner annulus is formed between the outer pipe column and the inner pipe column. The outer pipe column comprises multiple communication devices with holes, wherein the communication devices with the holes are sequentially connected from top to bottom through first oil pipes, and each first oil pipe is sleeved with a packer. The inner pipe column comprises a telescopic pipe, a fire-resistant component and a pulley type communication device with holes, wherein the telescopic pipe, the fire-resistant component and the pulley type communication device with holes are sequentially connected from top to bottom through second oil pipes. The gas injection pipe column for top-to-bottom layer-by-layer fire flooding achieves top-to-bottom layer-by-layer gas injection of a thick oil reservoir and greatly improves the oil flooding effect and oil flooding efficiency.