This research challenge is determined by the need to take a step further regarding sustainable development within a professional and vocational education training (VET) context, by means of understanding its framework and current situation in Catalonia (Spain), concerning the things that have been done as well as the lack of actions or weaknesses. In particular, this information will be mainly analysed starting from the 17 Sustainable Development Goals (SDG), within the 2030 horizon, stated by UNESCO. Within these goals, the present research is dedicated to both 4 and 5 SDG, being titled as quality education and gender equality, respectively, and more specifically, focused on the elimination of gender disparities in VET. This research will be based on a theoretical framework of gender disparity evidences and empirically accompanied with a survey made with the participation of different VET teachers from a State high school in Catalonia. This survey is basically oriented towards different gender disparity issues that concern and burden the current situation of this matter within the VET system. The results of the survey embrace the fact that gender stereotypes are notably present in our society, and in consequence, in our schools. VET teachers and high schools are a key element in order to improve this handicapped situation. Future lines that should be recommended are based on integrating gender competences as well as promoting gender-sensitive environments.