Replenishment control method of a multi-drum washing machine

A water replenishment control method of a multi-drum washing machine, said multi-drum washing machine including a first washing drum and a second washing drum, the method comprising:

• executing a water supply process of supplying water to the first washing drum until the water reaches a first set value;
• during a washing process by the first washing drum, if a water level of washing water is lower than the first set value, a water replenishment process is executed wherein water is added to the first washing drum until the water reaches the first set value,
• it is determined whether the second washing drum is executing a water replenishment process wherein water is being added to the second washing drum during a washing process by the second washing drum until the water reaches a second set value or a water supply process wherein water is being added to the second washing drum before the washing process until the water reaches the second set value, before the water replenishment process of the first washing drum is executed,
• if it is determined that the second washing drum is executing the water replenishment process, the first washing drum pauses executing the water replenishment process, the second washing drum preferentially executes the water replenishment process;
• if it is determined that the second washing drum is executing the water supply process, the second washing drum is suspended in the water supply process, then the first washing drum executes the water replenishment process, and the second washing drum continues executing the water supply process after the first washing drum completes the water replenishment process.