The invention discloses a fan blade cleaning system for an aircraft engine. The fan blade cleaning system comprises a housing, a slide wheel rail, a carrying electric rail car, a first air curtain machine, a second air curtain machine, an air feeder, a gas filter device, an assembly line I and an assembly line II. The fan blade cleaning system has the effects that a manual cleaning step can be avoided, health of a worker is protected, humanistic care is shown, cleaning efficiency is improved, and economic benefits are improved. The invention provides an efficient automatic cleaning way which simplifies the cleaning procedure, shortens working time of the cleaning process, finally saves labor cost, improves working efficiency, and brings considerable economic benefits for an aircraft maintenance company. The fan blade cleaning system can improve a working environment of an air aircraft maintenance worker, improves corresponding working efficiency, shows civil aviation scientific and technological level, and has wide social benefits. Development of the system takes a giant step towards a more user-friendly and intelligent direction, so that novel attempt and exploration is performedon future maintenance work and a maintenance company.