The integration of ICT in science subjects suffers from a lack of materials designed to develop practical work with students. Virtual laboratories are a resource that allows simulating the working conditions of a face-to-face laboratory overcoming some of the limitations of these activities and promoting new approaches (López, 2007). The general objective of the project is to implement the use of virtuous laboratories as an educational strategy to improve the argumentative competence of sixth year students in Natural Sciences. A descriptive approach with quantitative methodology was adopted, allowing the statistical analysis of the data. The project was conducted at the educational institution Rufino José Cuervo Centro, in Armenia, during 2017. The process consists of three phases: collection of sources, surveys to evaluate the importance of two virtual laboratories and evaluations to measure argumentative competence. The results of three tests (initial diagnosis, post-intervention monitoring and " Develop your Competencies ") indicate the improvement of the grades of the experimental group. In conclusion, the data support that the virtual laboratories effectively improve the argumentative competence in Natural Sciences, showing significant progress in the comprehension and expression of arguments by the students.