The invention discloses a sweater steaming ironing setting machine. The sweater steaming ironing setting machine comprises a rack, a steam ironing device, a piece receiving mechanism, a transferring motor, a pressing plate motor and a process control device, wherein the rack is in the type of a workbench, is divided into a front part and a rear part and is provided with a front end rolling shaft set, a middle rolling shaft set and a rear end rolling shaft set, and the rolling shaft sets are connected with the transferring motor. The steam ironing device comprises a transferring mechanism, a front part, a rear part steam evaporation box, a steam pipeline, a dehumidification draught fan, a steam valve, a dehumidification valve and a rear procedure pressing plate mechanism. The transferring mechanism is composed of a transferring cloth belt, a chain and a connecting spring. The rear procedure pressing plate mechanism comprises a rear pressing plate and a rear pressing plate lifting mechanism. The piece receiving mechanism is composed of a motor, a piece receiving frame, a gear and rack mechanism and a chain connecting component, wherein the piece receiving frame is installed at the rear of the rack and below the transferring cloth belt. The sweater steaming ironing setting machine integrates the various functions of automatic steaming, ironing and dehumidification, and a whole sweater can be ironed to be set; automatic process control is achieved, and manual operation workload is reduced; production efficiency and economic benefits are improved.