Under the current background of carbon neutralization, the quantification of carbon neutralization in Qinling mountains and the calculation of its spatial service scope are of great significance for rational planning and rapid realization of carbon neutralization. Intelligent Urban Ecosystem Management System (IUEMS) was used to calculate the amount of carbon sequestration in the Qinling mountains. The spatial quantification of carbon emissions in the Qinling mountains was carried out by fitting the model with the data of night light and energy consumption of various cities. Based on carbon sequestration and carbon emissions, the spatial carbon neutralization of Qinling mountains was obtained. PLUS (The patch-generating Land Use Simulation Model) was used to simulate the spatial distribution of carbon sequestration in 2030 and 2050. Combined with the diffusion coefficients of common gases, the service scope of carbon neutralization for surrounding regions in Qinling mountains was obtained. The results showed that the carbon sequestration in the Qinling mountains showed an upward trend from 2000 to 2020, and the carbon sequestration rate in most regions showed a positive trend at different time scales. The carbon sequestration in the central and western regions of the Qinling mountains was larger in space. The topographic features that have great influence on the carbon sequestration in the Qinling mountains were slope, half sunny slope and half shady slope with an altitude of about 1200 m. In the study area, the overall spatial carbon emission was low, and the area with low carbon emission value accounted for 90% of the total area of the Qinling mountains. The area with large carbon emission was mainly located in the urban area of the northern slope of the Qinling mountains. In terms of time, the maximum carbon emission increased first and then decreased. From 2000 to 2050, the service range of carbon sink in Qinling mountains is 174-262.63 km, and the service range is gradually expanding in space, and the expansion degree will decrease slightly after 2030.