The invention discloses a vacuum medium-frequency induction furnace. The vacuum medium-frequency induction furnace comprises a furnace body, wherein a vacuum chamber is arranged in the furnace body and comprises a first heating cavity and a second heating cavity arranged in the first heating cavity, an object to be heated is arranged in the second heating cavity, a quartz tube is arranged in the wall of the first heating cavity, a graphite sleeve tube is arranged in the wall of the second heating cavity, and an induction coil is wound outside the quartz tube and electrically connected with a medium-frequency power source. Through the induction coil input with medium-frequency alternating current, an alternating magnetic field is generated and generates identical-frequency induction current in the graphite sleeve tube, the graphite sleeve tube is rapidly heated, and then the graphite sleeve tube transmits heat to the object in a heat radiation mode. The structure of the vacuum medium-frequency induction furnace is simplified, the occupied size of the furnace body is reduced, and the vacuum medium-frequency induction furnace has the advantages of being rapid in heating, high in stability and low in cost and is suitable for the field of scientific research in schools and enterprises.