1.Semi-continuous vacuum induction melting furnace has all the advantages of vacuum induction melting furnace and besides that. 2.the vacuum valves are installed on the semi-continuous vacuum induction melting furnace between charging room and melting chamber as well as between melting chamber and casting room so that the charge can be loaded and unloaded, the alloys can be added, and steel ingot can be discharged without destroying vacuum and semi-continuous operation can be realized. 3.Due the melting chamber stay in vacuum all the time, the service life of crucible is increased and the melting time is decreased. 4.The furnace is fit for melting iron-based alloys, nickel-based alloys, cobalt-based alloys, other precision alloys, supper-alloy, magnetic material as well as precision casting.