The popularity of short video apps provides more sharing platforms for tourists, and plays a more significant role in spreading the image of tourist destinations. Dalian City is selected as the case, and the data of the comments text of DouYin short video is analyzed by using the network text analysis method, and the tourism image of Dalian City is studied. The results show that the beautiful and romantic coastal city is still the city image that tourists have a deep perception of Dalian, but they have a negative perception of tourism services. In addition, the quality and authenticity of short tourism videos are also factors that tourists consider. Based on this, some suggestions are put forward, including constructing a multi-channel city image communication system, improving the quality of short tourism videos, strengthening the quality management of tourism services, and strengthening the publicity of red tourism.