The article is an attempt to explain the participation of the Military Police as a non-financial preparatory proceeding body in fiscal penal proceedings, namely in cases concerning fiscal offences and misdemeanours detected within the scope of their ratione materiae jurisdiction. The article pays much attention to the Military Police entitlements in the fiscal penal procedure and the assessment of the scope of those rights in the currently binding legal state. The author also formulates de lege ferenda proposals probably constituting suggestions for the legislator to extend the jurisdiction of the Military Police. The article also discusses the issue connected with determining an entity performing procedural activities of the Military Police, i.e. the rights of their authorised representatives. In addition, the analysis covers the issue of a prosecutor for military matters’ supervision of preparatory proceedings conducted by the Military Police in cases concerning fiscal offences and misdemeanours.