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Glomalin-related soil protein (GRSP), a glycoprotein derived from mycorrhizal fungal hyphae, is a mixture of substances rich in various elements essential for plant growth. However, the impacts of tree diversity and forest structure on the element content and storage of GRSP are not well understood. To investigate this, we collected soil samples from 720 plots (10 m × 10 m) and determined the relative content and storage of elements (C, N, O, Si, P, Fe, Al, Na, Mg, Ca, and K) in GRSP. Additionally, the tree diversity, tree size and density, tree assemblage, and soil physicochemical properties were determined. The results show the following: (1) Plots with lower diversity had 1.27 times higher storage of 11 elements in GRSP compared to those with higher diversity. Plots with higher soil electrical conductance (EC) plots had 28–35% higher storage of 11 elements in GRSP. (2) The relative content of Na, C, and N in GRSP showed a positive relationship with pH, while they exhibited a negative relationship with soil EC, available phosphorus (AP), and tree density. Other elements generally showed contrasting patterns. (3) Path analysis reveals that tree diversity and tree growth had stronger effects on the elemental composition of GRSP than tree spatial assemblage. The magnitude of the driving path coefficients depended on the factors closely related to soil pH. This study demonstrates that the elemental composition of GRSP can be dynamically affected by tree diversity and stand structure, with soil pH playing a crucial interactive role. Full article