A metal particle manufacturing system includes: a first airtight container, in which a metal film is placed and conveyed; a plasma melting chamber for heating and melting the metal film into ultrafine particle metal; a second airtight container for cooling and suspending the ultrafine particle metal for collection and being taken out; and a circulating conveyor belt for providing conveying channels between the first airtight container, the plasma melting chamber and the second airtight container. Airtight channels are provided to cover between the first airtight container, the plasma melting chamber and the second airtight container. With this implementation, the highly pure ultrafine particle metal with the purity reaching 99.99% can be obtained.