The main motive of writing this paper is to create a facial mask detector that can find whether a person has worn a facemask properly or not. This paper is used to solve real-life problems that nowadays we must avoid. So it helps any person. After implementing this detector, we can easily classify people who are wearing a face mask and the people who are not wearing the mask and people who are incorrectly wearing facemasks. The proposed method of this paper uses the YOLO algorithm. This detector can be used for precautionary purposes during the spread of COVID-19