Communication plays an important role in the work of investigators and determines their performance throughout their professional career. Investigators’ communication skills ensure the establishment and development of business contacts with various categories of participants in professional relationships, and allow them to formulate profitable interaction strategies. Therefore, in the professional training of cadets i.e., future investigators, developing their communication skills is an important applied task. The research aims to investigate the communication skills of cadets of investigative specialization (future investigators) in the process of their professional training. The research was conducted using psychodiagnostic tools among cadets of the investigative specialization of Kharkiv National University of Internal Affairs (n = 597). It has been established that most of the subjects of interest have stable manifestations of the ability to form the skill to apply justified models of behavior during communication; they reveal a gradual development of the ability to navigate in situations of professional interaction and adapt to new living conditions. Two main variants of manifestation of the communication abilities of cadets i.e., future investigators with participants of interpersonal interaction have been identified: 1) with a predominant tendency to independence, leadership, and dominance; 2) with responsibility, focus on cooperation, and coherence with others. The results of the research confirm the influence of professional training on the process of communication skills formation in cadets i.e., future investigators.