The invention discloses a dish-washing machine which comprises a washing pool, a storage rack, a flushing pipe, an ultrasonic device and an oil pushing plate. A water inlet and a water outlet are formed in the bottom of the washing pool, an oil discharge overflow groove is formed in one side of the washing pool, an inner side plate of the oil discharge overflow groove is higher than the groove face of the oil discharge overflow groove, and the oil discharge overflow groove can slide vertically along the inner wall of the washing pool. The storage rack is arranged in the washing pool, and used for containing bowls and dishes. The flushing pipe is correspondingly wound on the washing pool inner wall around the storage rack. The ultrasonic device is arranged in the washing pool. The oil pushing plate is arranged above the washing pool in a vertically telescopic mode, can horizontally move and is used for pushing floating oil on the water surface of the washing pool into the oil discharge overflow groove. In a use state, one part of the oil pushing plate is lower than the highest water level of the washing pool, and the oil pushing plate moves towards the oil discharge overflow groove. According to the dish-washing machine, secondary pollution caused by oil stains to the bowls and dishes in the sewage drainage process is avoided.