The ultra high pressure water-jet cutter includes an ultra high pressure pump, an accumulator, an abradant jetter, an abradant-control valve, feeding pipes and valves. Its characteristics are that the side wall of the mixing cavity of the abradant jetter has an abradant inlet and an air-flow intake, and the position of the abradant inlet is higher than that of the nozzle of the high pressure water and the position of air-flow intake is higher than that of the abradant inlet. The high pressure water inlet and outlet of the accumulator are located at the side wall of the accumulator and the air-intake pipe of the abradant-control valve has a air-flow regulating valve. The axes of interfaces of emery-inlet and emery-outlet are designed at the same straight line direction.
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