Catalytic jet combustion device

The utility model provides a catalytic injection combustion device which comprises a plurality of stages of catalytic injection components, a catalyst cavity is arranged in each catalytic injection component, and a central heat accumulator is arranged in each catalyst cavity. The catalyst cavity is filled with a second catalyst; a circular seam is formed between the side surface of the central heat accumulator and the inner wall of the catalyst cavity; a supporting connecting pipe is arranged between every two adjacent stages of catalytic injection components, and the catalyst cavities in the two adjacent stages of catalytic injection components are communicated through the supporting connecting pipes. A thermocatalytic cover is arranged on the periphery of the supporting connecting pipe between every two adjacent stages of catalytic spraying components, and a through hole is formed in each thermocatalytic cover; a high-temperature-resistant igniter is arranged in front of a circular seam of the first-stage c