Iran’s Department of Environment in is the main administrative organ for environmental protection and as the vice president and a governing body has a high organizational status in the country's administrative hierarchy. Effective protection of the environment requires the use of the tools and sufficient competence of environmental regulation. In this regard, this article, based on the descriptive and analytical legal method examines the issue of whether the Department of Environment has sufficient and appropriate competences for environmental regulation and whether it can be considered a regulatory body in the field of environment or not. In the end, it is concluded that the Department of Environment, despite having a suitable organizational status in the country's administrative law, does not have appropriate regulatory jurisdiction in comprehensive environmental protection, and this challenge can lead to weakness in fulfilling its responsibilities, and improper implementation of existing environmental laws and regulations. However, as a governing body, this organization could, in many environmental issues and within the framework of the laws, pass appropriate regulations to facilitate the implementation of environmental laws and regulations for executive bodies and the private sector, resolve the ambiguities and gaps in the existing environmental regulations and to implement increasing coordination in environmental protection in government institutions.