Threaded plug for aluminum-magnesium alloy investment casting support as well as preparation method and application of threaded plug

The invention relates to the technical field of investment casting, in particular to a threaded plug for an aluminum magnesium alloy investment casting support and a preparation method and application of the threaded plug. The invention discloses a threaded plug for an aluminum magnesium alloy investment casting support. The threaded plug is mainly prepared from the following components in parts by weight: 80-90 parts of mixed powder and 10-20 parts of a plasticizer, the mixed powder comprises the following components in percentage by mass: 50%-70% of fused quartz coarse powder, 10%-20% of fused quartz fine powder and 10%-40% of zircon powder; the plasticizer comprises paraffin and beewax according to the mass ratio of (4-9): 1. The threaded plug prepared by adopting proper raw materials has proper strength, can ensure the integrity of the thread shape when being matched with the thread of the shell dewaxing port, and has higher bonding strength with the shell dewaxing port, and when the threaded plug is used