Manufacturing method of large-size and high-density bright iridium crucible

The invention provides a manufacturing method of a large-size and high-density bright iridium crucible. The manufacturing method comprises the following steps that high-purity iridium powder is pressed and smelted into an iridium block, the iridium block is put into a heat-resistant ceramic crucible and a vacuum medium-frequency induction furnace for smelting, the vacuum medium-frequency inductionfurnace is vacuumized, then is filled with argon, the iridium block is heated to a complete melting state, then iridium liquid is slowly condensed, and an iridium ingot is taken out after repeating for at least 4 times; the iridium ingot with a thickness of about 20 mm is forged; the iridium ingot is heated, then is put on a rolling mill for hot rolling, two channels are rolled by heating for onetime, and the two pushing rates decrease sequentially; an obtained iridium plate is correspondingly cut out of the crucible bottom and the crucible body; the crucible body is subjected to edge rolling by an edge rolling machi