The invention relates to a pipe network type SCR denitration catalyst hot-air soot blowing system, which comprises a compressed air storage tank, a heating coiled pipe, a reactor, catalysts, gas collecting bags, electromagnetic valves, a soot blowing pipeline header and a pipe network soot blowing layer. A gate valve is arranged at an outlet of the compressed air storage tank, and the compressed air storage tank communicates with the heating coiled pipe located on a conical flue at the lower end of the reactor; a plurality of layers of catalysts are arranged in the reactor, each layer of catalyst is provided with the corresponding gas collecting bag, inlets of the gas collecting bags communicate with an outlet of the heating coiled pipe, outlets of the gas collecting bags communicate withthe soot blowing pipeline header, and the electromagnetic valves are arranged at the outlets of the gas collecting bags correspondingly; the soot blowing pipeline header is fixed to the inner wall ofthe reactor. The pipe network type SCR denitration catalyst hot-air soot blowing system has the beneficial effects that compressed air is adopted for strong sweeping in the vertical direction, the technical characteristics of high pertinence, wide covering area, non soot cleaning dead corner and the like are achieved, the service life of the catalysts is further prolonged, the replacing period ofthe catalysts is prolonged, and thus denitration efficiency is improved and the operation cost is saved.