The invention relates to a washing, dehydration and drying continuous processing process, and belongs to the technical field of fiber treatment. The process comprises a cleaning procedure, a dehydration procedure and a drying procedure which are set in sequence, and fibers to be treated are cleaned through the cleaning procedure and then fed into the dehydration procedure; the dehydration procedure is completed in a dehydration mechanism, and the dehydration mechanism comprises a rotary barrel, a material inlet, a supporting plate and a material outlet. The rotary barrel is driven by a motor, and the supporting plate is mounted in the rotary barrel in a sliding mode. The cleaned materials enter the rotary barrel through the material inlet, after the cleaned materials fall onto the supporting plate, the motor drives the rotary barrel and the supporting plate to rotate together, meanwhile, the supporting plate and the rotary barrel do vertical reciprocating motion, the materials are moved upwards, and after dehydration is completed in the moving process, the materials are conveyed into a drying mechanism through the material outlet to be dried. The process is applied to fiber cleaning treatment, and has the advantages of being fast in dehydration, even in drying, low in energy consumption, low in cost, capable of achieving continuous operation and the like.