The invention relates to a wind power generation system with the cleaning function. The system comprises a base and a plurality of wind power generation devices arranged on the base. Each wind power generation device comprises a windmill rod, a shaft base, a wheel hub and blades, a cleaning device is further arranged on the base, and comprises a moving mechanism, a supporting mechanism, a rotating mechanism, an adjusting mechanism and a flushing mechanism, the moving mechanism comprises a moving block, a first motor and a first cylindrical gear, the rotating mechanism comprises a second motor, a second cylindrical gear, a third cylindrical gear, a rotating shaft and a rotating disc, the adjusting mechanism comprises a third motor, a drive plate, a fixed plate and an adjusting assembly, and the flushing mechanism comprises a plurality of flushing assemblies. According to the wind power generation system with the cleaning function, through the cleaning device, the blades of all wind power generation devices can be automatically cleaned, the service life of the blades can be prolonged, compared with manual cleaning, more time and labor are saved, labor intensity of workers is reduced, and safety accidents are avoided.