The invention relates to a high-strength ultrasonic washing instrument, which comprises an ultrasonic head for producing cavitation clouds. The high-strength ultrasonic washing instrument is characterized by also comprising a guiding device, wherein the guiding device is sheathed on the ultrasonic head; the guiding device is provided with grooves or holes for changing the cavitation clouds generated by the ultrasonic head from the vertical arrangement to the radial arrangement or for further concentrating the vertical arrangement based on the actual requirements; the bottom of the guiding device is provided with a bottom strip-shaped groove for further concentrating the vertical arrangement of the cavitation clouds generated by the ultrasonic head; the bottom of the guiding device forms a tapered structure for further concentrating the cavitation clouds; the lateral side of the guiding device is provided with a lateral strip-shaped groove for changing the cavitation clouds generated by the ultrasonic head from the vertical arrangement to the radial arrangement; the lateral side of the guiding device is provided with several holes for changing the cavitation clouds generated by the ultrasonic head from the vertical arrangement to the radial arrangement; and the holes are uniformly distributed. The invention achieves the purpose of washing the inner surfaces of round holes in round pipes or other workpieces, micro holes, blind holes, micro grooves and blind grooves.