The invention discloses an SCR denitration method and device with a combined soot blowing function. The device comprises an SCR reactor, wherein steam soot blowers and sonic soot blowers are arrangedin sequence in the counter-smoke flow direction above each catalyst bed layer in the reactor; differential pressure transmitters are arranged between the upper and lower portions of the catalyst bed layers; all steam soot blowers are connected in parallel and then externally connected with an high-temperature steam source, each parallel pipeline is provided with a high-temperature steam electric valve respectively, and a main pipe is provided with a temperature sensor; all acoustic sensors are connected in parallel and then externally connected with a compressed air source, each parallel pipeline is provided with a compressed air electric valve respectively, and the main pipe is provided with a pressure transmitter; the device further comprises a controller, the temperature sensor, the pressure transmitter and all differential pressure transmitters are connected with the controller separately, and all high-temperature steam electric valves and compressed air electric valves are connected with the controller separately. The SCR denitration method and device with the combined soot blowing function solves the problems that the content of denitrated particulate matters of the SCR in acement kiln is large, large granular particles in soot cannot be removed, and the thermal energy loss is large due to the steam consumption of a pure steam scoot blower.