Cultural ecosystem services (CES) are important indicators for evaluating the characteristics and value of urban green space. This paper takes Xingqing Gong Park as the research object. Relevant comments on Internet platforms such as Dianping, Meituan, and Ctrip were collected before and after the park’s renovation. The sentiment tendency of the remarks was statistically analyzed using sentiment computing techniques, and the satisfaction index of cultural ecosystem services before and after the park renovation was finally obtained. At the same time, the questionnaire survey was used as the control group for sentiment computing, and the results of the two methods were cross-corroborated and corrected to obtain more objective and accurate conclusions. The results show that visitors are more satisfied with the cultural services of traditional garden elements such as buildings, sculptures, and bridges after the renovation and more dissatisfied with the amusement and fitness facilities closely related to the users’ daily activities. At the same time, the plants of the renovated park do not perform well in all cultural services. The study shows that sentiment computing based on online comments is an effective tool to quantify the satisfaction of cultural services in urban parks; the cross-application of sentiment computing techniques and traditional empirical methods can effectively avoid the calculation bias caused by a single technical path; and the quantitative results of the cultural services by the sentiment computing techniques can reveal problems in the process of park renovation and provide a basis for the subsequent management of the park.