This article aims to explore how populist national leaders use social media to communicate with people during the COVID-19 pandemic. By examining Philippine President Duterte’s use of social media, the researcher identified four populist communication styles in his pandemic prevention and control messages: (1) The way to "appeal to the people" has changed; (2) The anti-elite and antiestablishment messages have disappeared; (3) COVID-19 is defined as the only common enemy to people; (4) A hope is constructed for people that the solution to the pandemic has to rely on the aid of Chinese vaccines. Findings of the research indicate that Duterte’s online populist messages were full of self-praising of his own pandemic control policy, his plans, and his officials. However, since Duterte’s messages were still expressed in the styles that violated the values of democracy, it is afraid that a kind of populist authoritarianism was formed in the name of pandemic prevention and control.