To provide a cleaning apparatus of a denitrification filter allowing short time cleaning without removing the denitrification filter.

The cleaning apparatus comprises a traveling cart (30) travelably loading a cleaning device of the denitrification filter on a rail (10), a rectangular device frame (40) suspendedly supported to the traveling cart (30) and fit into the frame (12A) of a filter unit (12), and a device body (50) suspendedly supported to the traveling cart (30). The device body (50) comprises a shot tank (53) storing soft blast particles, a shot gun (54) dispersingly jetting the blast particles in the shot tank (53) toward the denitrification filter (13) with compressed air, and air nozzles (59) jetting the compressed air to the denitrification filter (13) to accelerate the dispersingly jetted blast particles to hit the particles to the lower denitrification filter (13).

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