The arrival of COVID-19 completely changed people's lives, at the end of December 2019 a new virus appeared that forced people to maintain social distancing and wear a mask in a mandatory way, because the virus caused by SARS-COV-2 is highly contagious and can be easily transmitted between people being announced as a pandemic by the World Health Organization. In the month of May, the virus infected more than 153 million people saturating the health system worldwide, therefore, it was established as a preventive measure to maintain social distancing in public places and use the mask in a mandatory way to help control COVID-19, as it reduces the amount of saliva emissions and respiratory microdroplets of individuals carrying the virus. In view of this problem, this article designed a face mask detection system to control the entry of people into a medical center, so that the system analyzes several people who want to enter the place and shows if they use the mask correctly through a monitor, requiring to respect this important biosecurity measure, in addition to being able to be implemented anywhere you want to control the entry of people with a mask. By designing the system, it can be said that the system works in the best way and would be helping to prevent several people from continuing to catch COVID-19.