With the increasing complexity of aerospace equipment, the demand for collaborative modeling is rising, making it difficult for traditional cross-disciplinary modeling methods to suffice. To address this challenge, this paper proposes a Model-Based Systems Engineering (MBSE) method for cross-disciplinary collaborative modeling of aerospace equipment. Initially, the requirements and overall design specifications of aerospace equipment are modeled. Subsequently, a multi-level, cross-domain collaborative modeling system is established. Finally, using MBSE-specific allocation matrices and traceability diagrams, the modeling indices are assigned and tracked. Compared to traditional methods, MBSE-based cross-disciplinary collaborative modeling effectively resolves issues of collaboration difficulty and indicator change traceability.