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The application provides a subcutaneous focusing ultrasonic device, and relates to the field of focusing ultrasonic cosmetic technology, which comprises a handle part, an ultrasonic working head arranged at the distal end of the handle part, the ultrasonic working head being configured to be attached to the surface of human skin and emit ultrasonic pulses to the human skin along a first direction to form an ultrasonic focus in subcutaneous tissue, the first direction being perpendicular to the surface of human skin, a flexible connecting part connected between the handle part and the ultrasonic working head, the flexible connecting part being configured to be able to stretch and contract along the first direction to compensate for the depth deviation of the ultrasonic focus caused by the change of holding pressure, and an adjusting system configured to adjust the length change of the flexible connecting part along the first direction, when the holding pressure on the handle part increases, the adjusting system makes the flexible connecting part contract along the first direction, and when the holding pressure on the handle part decreases, the adjusting system makes the flexible connecting part elongate along the first direction. The stability of the ultrasonic focus in the treatment process in the related art is improved.