The invention discloses a water carving machine capable of carving on an irregular plane. The water carving machine comprises a rack, a water spray nozzle, a high-pressure water pump, a drive device used for driving the water spray nozzle to move and a control system electrically connected with the drive device. The drive device comprises an X-axis movement drive mechanism, a Y-axis movement drive mechanism and a spray nozzle positioning mechanism. The water spray nozzle is arranged on the spray nozzle positioning mechanism which comprises an elastic telescopic rod. The tip end of the elastic telescopic rod is provided with a ball accommodation cavity which is internally provided with a ball. Part of the ball is exposed outside the ball accommodation cavity. The water spray nozzle is arranged close to the end of the elastic telescopic rod. The water carving machine capable of carving on the irregular plane can automatically adapt to the plane of a carved article in shape and can automatically adjust the carving depth, angle and orientation to achieve the purpose of carving on the wall surface.