Device for rapidly growing large diamond single crystals

The utility model discloses a device for rapidly growing large diamond single crystals, and belongs to the technical field of gem-grade diamond single crystal equipment. The device comprises a pyrophyllite composite block, a pyrophyllite ring I, a conductive steel ring I, an aluminum oxide ceramic chip I, a dolomite ring I, a graphite sheet I, a graphite ring I, an aluminum oxide ceramic ring I, a graphite sheet III, an adjusting sheet, a nitrogen removal sheet, a carbon source, a catalyst, a seed bed, a magnesium oxide sleeve, a graphite pipe, an insulating pipe, a graphite sheet IV, a graphite sheet II, an aluminum oxide ceramic ring II, a graphite ring II and a conductive steel ring II. And a dolomite ring II, a pyrophyllite ring II and an aluminum oxide ceramic chip II. An annular heating heat source is arranged in the device and can improve synthesis resistance, reduce synthesis power and enable radial temperature distribution to be uniform, meanwhile, the heights of upper and lower auxiliary heat source