The invention relates to the field of cavitation treatment of liquid media with a specific content of water or another liquid phase which exceeds 65-70% of the total mass, as well as to the treatment of products located in the liquid medium being treated. An oscillatory system with a liquid medium and objects comprises surface walls, each of which is in the form of a membrane fixed over the contour of a casing, said membrane having a natural frequency of the oscillations, taking into consideration the connected mass of oscillation exciter, which is equal to the first harmonic. The emission of the ultrasonic waves into the liquid medium is performed simultaneously from all the membranes, thereby ensuring the effect of superimposition of waves in the volume undergoing treatment so as to form a standing acoustic wave or a plurality of waves of different frequencies. The amplitude of the resonant oscillations of each membrane exceeds the threshold of acoustic cavitation for the liquid medium with objects arranged therein. The frequencies and phase characteristics of the oscillations of the membranes are selected such that they can correspond to one another or differ from one another in order to produce the maximum required cavitation action taking into consideration the characteristics of the medium being treated. The oscillatory system can have any desired form and continuous-flow or steady-state conditions for the movement of the liquid medium. The invention makes it possible to increase the effectiveness of the cavitation action on a medium being treated and objects arranged therein whilst at the same time limiting the power of the ultrasonic emitters.Linvention se rapporte au domaine du traitement par cavitation de milieux liquides dont le contenu spécifique en eau ou autre phase liquide dépasse 65-70% de la masse globale, ainsi quau traitement dobjets se trouvant dans un milieu liquide à traiter. Un système doscillation avec un milieu liquide et des objets comprend
