The entire production team, including the masked celebrity singers, the host and the judges, are now in self-isolation, the show announced.
The show is filmed in Melbourne which has been at the centre of a spike in coronavirus infections.
Residents across the state of Victoria are subject to strict lockdown rules.
These include a night-time curfew, the closure of restaurants and gyms, only one hour of outdoor exercise a day, no travel further than 5km (three miles) from home, and only one person per household allowed to shop for essentials at a time.
The production of The Masked Singer had been allowed to continue despite the restrictions because news and media outlets are considered essential services.
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