A double-head drainage pump of a washing machine includes a pump housing in which a water inlet is formed. A first water outlet and a second water outlet are formed in the pump housing. A first drainage motor is mounted on the pump housing corresponding to the first water outlet and a second drainage motor is mounted on the pump housing corresponding to the second water outlet. The first drainage motor controls opening/closing of the first water outlet, and the second drainage motor controls opening/closing of the second water outlet. The first water outlet and the second water outlet which share one water inlet are formed in the pump housing, the first water outlet is used for drainage of the washing machine, and the second water outlet is used for water reuse drainage.

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