The regional ecological environment on which architectural heritage depends is one of the most important external factors affecting the overall protection of architectural heritage. A rapid, accurate and objective understanding of the ecological conditions of the architectural heritage regions within the city limits where human disturbances are more frequent is of great practical significance for the study of the overall conservation and heritage of the architectural heritage areas. Based on the remote sensing monitoring data from 1995 to 2019, using the Remote Sensing Ecological Index (RSEI) as a visual index, this study systematically analyzed the spatio-temporal evolution of the ecological environment status of Former Qing architectural heritage area in Shenyang during the past 25 years. The results indicated that: (1) The average RSEI represented a fluctuating upward trend in early Qing era architectural heritage area and various heritage types. The average RSEI of ancient tombs showed a significant growth trend, while the ancient buildings showed a low-speed growth. (2) The ecological environment of Former Qing architectural heritage area in Shenyang has been continuously improved, and the overall ecological environment quality of ancient tombs has a significant improvement trend. The proportion of ecological environment improvement area in ancient buildings is lower than that in ancient tombs. The ecological environmental quality are obviously polarized in each architectural heritage area each year.