Microbial necromass carbon (MNC) is the most important component of stable soil organic carbon (SOC). Vegetation restoration affects SOC stocks, yet the response of MNC and associated microbial mechanisms remain understudied in coal mining areas of semi-arid deserts. Here, we investigated the influence of vegetation type and soil depth on MNC accumulation and its possible drivers in a desert mining area after 11 years of revegetation. The results showed that the contents of SOC and MNC, particularly fungal necromass carbon (FNC), increased in shrubland (SL) plots compared to grassland (GL) and mixed vegetation (GS) plots. MNC contributed an average of 38.5% to SOC in the 0-100 cm soil profile (primarily topsoil) of SL plots, greater than that of GL (28.1%) and GS (28.6%) plots. Vegetation type strongly shaped soil fungal diversity, but not bacterial diversity. SL plots were enriched with Bacteroidota (r-strategists), whereas Actinomycetota, Chloroflexota, Gemmatimonadota, and Basidomycota (K-strategists) were depleted. Fungal pathotrophs, symbiotrophs, and saprotroph-symbiotrophs also increased in SL plots, alongside heightened complexity and robustness of networks dominated by positive links. Fungal diversity, community composition, and network complexity directly drove MNC accumulation, with FNC as a principal contributor to SOC. Soil depth indirectly influenced the necromass accumulation coefficient by altering MNC content through its negative effect on microbial diversity and community composition. These findings indicate that fungal rather than bacterial communities govern MNC accumulation during longterm vegetation restoration. This study provides mechanistic insight into microbial-mediated MNC dynamics under in-situ revegetation, supporting land degradation control in semi-arid deserts.