The object of the research is the process of ultrahigh-frequency (UHF) treatment of livestock production biowaste aimed at its disinfection and energy-efficient processing. The problem lies in the absence of scientifically grounded methods for designing continuous-flow UHF installations capable of providing uniform heating of biowaste of varying composition with minimal energy consumption and without loss of nutritional value. As a result of the conducted theoretical and experimental studies, the dielectric properties of different types of biowaste (fat, blood, bones) were analyzed, and their influence on the efficiency of electromagnetic energy absorption was determined. The aim of the work was to establish the regularities of interaction between the electromagnetic field of a combined resonator and biowaste to enhance the energy efficiency of the process. The dielectric parameters of biowaste (ε′=50–60; ε″=10–25) and the electrodynamic characteristics of resonators of various geometries were determined. It was found that a combined “hemisphere + cylinder” resonator provides a quality factor Q=6910–9270 and an electric field strength Е=0.6–3.5 kV/cm, which increases energy efficiency by 15–18% compared to the cylindrical type. A mathematical model of the electric field distribution and a heating model were developed. Strong correlations ε′–Q (r=0.93) and ε″–E (r=0.88) were obtained, explaining the interdependence between electrophysical and resonator parameters. The obtained results are distinguished by a comprehensive approach to process modeling and the possibility of dynamic regulation of UHF field parameters, which prevents overheating or underheating of the material. The practical significance of the results lies in the development of energy-saving, environmentally safe next-generation UHF installations for the disinfection and processing of biowaste under farm, pilot, and industrial conditions.