Soil is a unique “quantum mechanics” system, and significant orbital hybridization effects occur at soil solid-liquid interfaces. Orbital hybridization effects play a critical regulatory role in soil properties, processes, and functions. However, this concept has not been given much attention in the context of soil solid-liquid interfaces. In the present study, the structure and properties of soil solid-liquid interfaces were quantitatively described based on classical interfacial reaction theory, and atom/ion orbital hybridization in the electric field at the soil particle surfaces as well as its influence on ion-particle and particle-particle interactions were characterized. The intrinsic correlation and regulatory pathways were elucidated for different soil environmental processes, such as mineral weathering, soil acidification, heavy metal passivation/activation, soil water movement, and phosphorus transport. They reveal a multi-scale coupling and multi-process linkage mechanism spanning: subatomic orbital hybridization effects → microscale interfacial reactions → mesoscale soil particle interactions → macroscale soil processes and functions. This cross-scale research framework provides a crucial theoretical foundation for advancing soil system functionality, enhancing cultivated land quality, and strengthening agricultural environmental protection. The atom/ion orbital hybridization effects at the soil solid-liquid interfaces fundamentally arise from the interactions between the electric field and atoms. Future researches should prioritize advancements in the following domains: 1) Synergistic integration of modern analytical techniques and quantum mechanical theories to elucidate surface reaction mechanisms governed by orbital hybridization; 2) Development of precise predictive models for water-soil-solute transport dynamics; 3) Revealing multiscale coupling mechanisms between microscopic soil processes and macroscopic manifestations; and 4) Establishing a quantum mechanics-based core theoretical framework for soil science.