Abstract: A smart mask with IoT function includes an airtight mask and an air filter device. The airtight mask has an inlet and an outlet. The air filter device has an input port and an output port connected respectively with the inlet and the outlet, and configured to provide clean air to the inlet. First, breathing data can be collected via the IoT function. Next, an algorithm can be implemented to allow the user to adjust the provision of the air to feel more comfortable during wearing the smart mask.