Computational thinking (CT) skills are now a key part of everyday life and work, and CT has been incorporated into K-12 curricula worldwide. Combining the fundamental concepts of CT with English writing constitutes an innovative and sustainable learning strategy. However, few academic studies have examined the incorporation of CT into English writing. English writing frequently generates excessive stress and anxiety among students, yet motivation can mitigate the negative effect of anxiety. This study investigated the effects of the fundamental concepts of CT on reducing writing anxiety and increasing motivation toward English writing. A quasi-experimental design was applied, and data were collected from experimental and control groups through writing anxiety and motivation questionnaires. The results indicated that the fundamental concepts of CT exerted a more significant influence on the dimensions of writing anxiety and motivation than did a conventional learning method. In conclusion, the fundamental concepts of CT promoted organized and structured English writing, increased students’ writing motivation, and reduced their writing anxiety.