A powder recycling machine includes a casing, a powder collector, a dust-sucking system and a dust-removing system. An accommodation space within the casing is divided into a first space and a second space by a partition plate. The powder collector is disposed within the first space for collecting excess powder from the first space. The dust-sucking system includes a connector, a cyclone separator and a first suction device. The connector, the cyclone separator, the first suction device and the powder collector are sequentially in communication with each other through plural transmission ducts. The dust-removing system includes a second suction device. The first space, the second suction device and the powder collector are sequentially in communication with each other through plural guiding ducts. After the excess powder suspended in the first space is introduced into the dust-removing system, the excess powder is transferred to the powder collector.