In order to explore the Western social media‘s attitude toward the Sino-U.S. trade war and their focus of attention, the study has scraped related hot English tweets from Twitter, and conducted sentiment analysis and topic modeling of these texts. It is found that 83% of the tweets convey negative opinions, and their emotional reactions are intense; the topic modeling of the negative tweets reveals people‘s eight concerned focuses on the trade war which almost all center around the negative impacts it has brought to the United States and the world. The results show that Trump’s economic strategy of trade war has been widely criticized and condemned rather than supported by the public.