The article examines the different approaches of scientists to determine the essence of professional competence of future engineers-teachers of computer science in the field of information systems security, reveals the main approaches to the process of its formation. It is noted that the professional competence of future computer engineers in the field of information systems security should be understood as an integrated characteristic that determines their real ability to identify potential threats to the information educational environment of vocational education institutions and students, prevent unauthorized access to information. information flows, identify risk factors and potential threats, choose effective means of information protection in vocational and industrial institutions, independently solve typical and atypical professional problems and situations related to identifying potential threats to educational and industrial information environment and students. Much attention is paid to the formation of professional competence of future computer engineers in the field of information systems security, which is considered a component of their training, a complex process aimed at mastering sustainable practical skills based on motives, values, professionally important qualities personality, professional knowledge in the field of information systems security, which is manifested in effective professional activities and due to specific circumstances and situations. It is emphasized that professional competence in the field of information systems security should be related to the ability of future computer engineers to identify potential threats to the information educational environment of vocational education institutions and students, prevent unauthorized access to information, navigate information flows, identify risk factors and potential threats, choose effective means of information protection (moral and ethical, administrative and organizational, physical, technical, etc.), etc. Key words: information systems security, pedagogical engineer, professional training, professional competence, professional competence of computer engineers in the field of information systems security, formation of professional competence of computer engineers in the field of information systems security.